Transmission Fluid Change Cost in 2026: What Owners Paid, Flush vs Drain-and-Fill, and What the Makers Print

Do I need it? Do what your owner's manual schedule says for how you drive, and read the severe-service column if you tow, make short trips or sit in traffic; "lifetime" fluid usually means normal service only. Flush or drain-and-fill? For routine maintenance, a drain-and-fill with the fluid your manual names; most makers whose documents we read limit or warn against flush machines, and GM uses its own exchange only for specific shudder bulletins. What will it cost? We cannot give a reliable shop price: the estimator site we tried refused our check. Owners who wrote what they paid into safety complaints report a median of $358 for a fluid service, but those figures include repairs and come from people who had problems. Get a written quote that names the job, the fluid and the quantity.

A transmission fluid change is the cheapest thing that can happen to a transmission, and the word "flush" on a quote is where the price and the risk both start to move.

A transmission fluid service is any of four jobs, and they are not the same purchase. A level check, with a top-up or a drain-down. A drain-and-fill, which replaces the fluid that comes out of the pan, sometimes with a new filter or pan gasket. A flush or machine exchange, which pushes new fluid through while the old comes out. And a repeated drain-and-fill, which several makers prescribe instead of a machine. Each has its own price, its own labor time in the maker's documents, and its own way of going wrong.

We searched NHTSA's index of manufacturer communications for documents on transmission fluid type, fill and level-check procedures, service intervals and flush instructions, and a second, independent search added what the first had missed: 546 distinct documents from Honda and Acura, GM, Ford, Toyota and Lexus, Nissan and Infiniti, Hyundai, Kia, Mazda, Subaru, Volkswagen and Audi, BMW and MINI, Mercedes-Benz, Stellantis, Allison and others, plus five recalls where the defect or the remedy involves the transmission fluid. Again and again, the fix they print is a measured fill of one named fluid, and several of them warn against flush machines and universal fluids in plain words. How we read them is in the methodology at the end.

Then we read the complaints NHTSA received from 2015 to 4 October 2026 that our searches found describing a transmission fluid change, flush, drain-and-fill, top-up, level check, wrong fluid, or "lifetime" or sealed fluid: 3,280 in all, 278 of them found by a second search. Every complaint was sorted twice, independently, by the same written rules; the two sortings matched on 98% of them, and the rest were settled by a written rule. 2,719 were about a fluid service or fluid question on the owner's own vehicle. Owners who wrote down what a fluid service cost give 104 figures; the 57 described as paid or billed have a median of $358.

By the end you will know which of five routes your car is on, what each costs, what your maker actually prints about changing, checking and flushing the fluid, and the cheap cause that gets skipped when a flush is sold first.

Claims marked 🟢 rest on a document listed in the Sources section, read in full unless marked otherwise. Owner-reported figures are what people told NHTSA, published with ODI numbers, and every complaint count here comes from the 3,280 complaints sorted twice and published. This guide carries no shop-estimate ranges, so every dollar figure below is an owner's own number, a labor time printed by a maker, or a maker's warranty payment, labeled as such. An ODI number is the complaint's NHTSA reference number.

I built PulsCar, an app that works with an OBDLink MX+ scanner; nothing in this guide needs it, and a free code read at a parts store does the same job for the check below. I started it after a $380 "full diagnostic" in Phuket in 2025 led to roughly $6,000 over six months across several shops (the story is on the About page). A transmission fluid service is that pattern at its smallest: a cheap, reasonable-sounding job that can be the right maintenance, the wrong repair, or the first step of an expensive one, and the paperwork rarely says which.

What a transmission fluid service is, and the four jobs behind one line on a quote

Automatic transmission fluid (ATF) does three jobs at once. The same is true of the fluid in a CVT (a continuously variable transmission, with no fixed gears) and the oil in a dual-clutch DCT or DSG. It is the hydraulic fluid that applies the clutches, the lubricant for the gears and bearings, and the coolant that carries heat to a cooler. When it ages, wears or is the wrong type, shifts change before anything breaks. 🟢 Honda's Ridgeline bulletin 23-074 puts it in one line: "ATF deterioration causes high foaming and low viscosity."

Job 1: the level check. On a car with a dipstick, it takes minutes. On many newer automatics and CVTs there is no dipstick: the level is set at a plug, with the engine running and the fluid at a temperature read from a scan tool. 🟢 Honda's ServiceNews B16120B for the 9-speed in the 2016-17 MDX and 2015-17 TLX V6: "This transmission also doesn't use a dipstick. To check the ATF level, you need to run a special procedure."

Job 2: the drain-and-fill. The drain plug comes out, the fluid that drains is replaced, sometimes with a new filter or pan gasket. Only part of the fluid comes out; the rest stays in the torque converter, the cooler and the valve body. That is why makers that want more of it replaced repeat the job.

Job 3: the flush or machine exchange. A machine is connected to the cooler lines and pushes new fluid through while the old comes out. Shops sell it as a complete change. Makers split on it: GM uses its own exchange tool in its bulletins, and Honda, Volkswagen, Mazda, Kia and Allison print warnings or limits, as the atlas below shows.

Job 4: the repeated drain-and-fill. Two or three drain-and-fills with a drive between them, so that new fluid mixes with what stayed inside. 🟢 Honda's Pilot bulletin 23-073 defines its "flush" that way: "NOTE: The term flush refers to repeatedly draining and filling the transmission with Honda Genuine ATF-DW1."

First: is it maintenance, or is it a symptom?

The same fluid service is maintenance on one car and a repair attempt on another, and the two need different questions.

Why the split matters. Of the 2,719 relevant complaints, 1,788 describe a fluid service done, recommended or quoted as a remedy for a transmission symptom that already existed. Owners often expect a fluid service to fix that symptom; in those complaints a fluid service is followed by improvement in 289 cases. A fluid service on a healthy transmission and a fluid service on a sick one are different events.

The maker atlas: who says change it, who says never, who says check it hot

Honda and Acura: three drain-and-fills, one named fluid, no flush machine. 🟢 For judder from the torque converter lock-up clutch after a software update, Acura's 16-063 (2012-15 MDX) and 16-066 (2012 RL, 2014-17 RLX) have the fluid replaced three times with 3.3 US quarts of ATF DW-1 per fill, at 1.4 labor hours, and say the fluid "needs to be changed even though the ATF Service Due message has not appeared". 16-066 says: "Other aftermarket flush systems are available, but American Honda strongly recommends that you avoid using them on any Acura vehicles." The 2023 Pilot and Ridgeline bulletins, 23-073 and 23-074, use the same three-time drain-and-fill with a software update for a "Transmission Temp Too Hot" message. The 9-speed units use a different fluid, ATF Type 3.1, and 🟢 B14070E warns that the red 8-speed dual-clutch fluid and the golden-green 9-speed fluid are "not compatible with each other. Never mix them up or you could damage the transmission."

GM: a named fluid and a machine exchange, for shudder. 🟢 GM's 16-NA-175, for 8L90 and 8L45 8-speed automatics in 2015-2018 trucks, SUVs and cars, prescribes a drain, new filter and refill with one fluid for shake or shudder (three drain-and-fills, a "triple flush procedure", for the 2017-18 Colorado and Canyon): "Requires Mobil 1 Synthetic LV ATF". A later bulletin, 18-NA-355, for shudder at a steady 25 to 80 mph, uses an exchange tool, 20 quarts in the machine (24 for the Corvette and CT6), stopping once 16 quarts of old fluid are collected, 1.1 labor hours, and in its last version says "Note: This procedure should only be completed once". Its sibling 19-NA-121 for 2019 Silverado and Sierra 1500 carries the same warning about mixing fluids in the exchange: "Intermixing of other types of transmission fluid or aftermarket additive packages will result in a low concentration level of new fluid and will not provide satisfactory results."

Toyota and Lexus: inspection only. 🟢 Toyota's T-SB-0006-11 and Lexus's L-SB-0001-11, for World Standard fluid in models such as the 2007-2015 Camry, 2004-2015 Prius and 2007-2015 RX350, print a "100,000 Mile Maintenance Interval" of inspection only and say "ATF-WS does NOT require any flushing or changing during the life of the vehicle." They add "ATF-WS is NOT compatible with T-IV or Dexron ATF."

Mazda: filled for life, flush only when told. 🟢 Mazda's SA-079/24 for SKYACTIV-DRIVE 6-speed automatics (FW6A-EL) in models from the 2012 Mazda3 to the 2025 CX-5 says "Only use “ATF-FZ” to fill or top off the fluid level." and "flushing is not recommended as part of service maintenance." For older Mazdas, 05-001/18 says "TRANSMISSION FLUID FLUSHING SHOULD ONLY BE PERFORMED WHEN INSTRUCTED BY THE WORKSHOP MANUAL OR ANY OTHER MAZDA PUBLICATION."

Volkswagen and Audi: schedules, and no flush machines at Volkswagen. 🟢 Volkswagen's 2019 US maintenance schedule (here) changes the 6-speed DSG fluid and filter every 40,000 miles and a non-DSG automatic's fluid every 80,000 miles, with the note "(not applicable for Canada; Filled for life)". Its fluid bulletin 37-18-02 says Volkswagen does "not support or warranty any use of" "aftermarket universal automatic transmission fluids or the machines used to flush the transmissions."

Kia and Hyundai: one fluid per model, a flush only with a new unit. 🟢 Kia's fluid guide TRA046, revision 5 of April 2025, prints the fluid and the fill capacity for every model and says "A flush is required ONLY when a transmission is replaced, and the transmission oil cooler is transferred to the new transmission." 🟢 Hyundai's 21-AT-006H lists its fluids and adds "Hyundai does not approve the use of any aftermarket ATF or gear oil additives."

Nissan, Infiniti and Subaru: the right CVT fluid, checked hot. 🟢 Infiniti's ITB14-040 for the 2013 JX35 and 2014-2015 QX60: "Do not use Automatic transmission fluid (ATF) or Manual Transmission fluid in an INFINITI CVT, as it may damage the CVT." Damage from other fluids is not covered under Infiniti's New Vehicle Limited Warranty. Nissan's CVT quick-check bulletin NTB18-055E reads the level with a gauge at 170 to 180 °F. 🟢 Subaru's 2013 parts memo for the 2014 Forester XT's CVT (CVTF) says its blue and orange CVT fluids "CAN NOT BE INTERCHANGED. Using the incorrect fluid will result in transmission damage."

Ford: the right fluid, and the cooler flushed only as necessary. 🟢 SSM 47093 for the 10R80 10-speed in 2017-2018 F-150 and 2018 Expedition, Navigator and Mustang names MERCON ULV and warns: "Using improper transmission fluid may" "result in internal transmission damage." 🟢 SSM 47547 for 2013-2019 Police Interceptors says "Use only the Transmission Fluid Exchanger process when performing" service intervals. The 2025-2026 10R80 clutch-cylinder bulletins we read tell technicians to flush the transmission fluid cooler only as necessary, and none of them makes a fluid change the repair.

BMW, Mercedes-Benz and the heavy-duty makers: levels and specs. 🟢 BMW's SI B24 03 16 traces overheating warnings on ActiveHybrid 3, 5 and 7 models to one line: "Transmission has been overfilled during the last fluid replacement service." 🟢 Mercedes-Benz's August 2026 LI27.00-P-080840 reports that NAG3 fluid supply was cut to half by damage at a Shell plant and lets dealers postpone routine transmission maintenance, while "Published maintenance intervals remain unchanged." 🟢 Allison's SIL 10-TR-99 Rev. CC, for commercial trucks and buses, not passenger cars, says "Fluid exchanging machines are not recommended or recognized due to variation and inconsistencies that may not guarantee removal of 100 percent of the used fluid."

The 10-minute check before you pay for any transmission fluid service

None of this needs tools beyond a flashlight, a paper towel and your owner's manual. It decides which of the five routes below you are on.

1. Find the line in your schedule. Look up "automatic transmission fluid", "CVT fluid" or "DCT oil" in the maintenance section of the owner's manual, and read both the normal and the severe column. 🟢 Hyundai's Genesis 8-speed bulletin 19-AT-011H is a good example of why both matter: no change under normal service, "Severe service Replace ATF every 60,000 miles", and severe includes "Repeated short distance driving" of 5 to 10 miles. Hyundai's list also names frequent mountain roads, heavy stop-and-go traffic with long idling, and trailer towing.

2. Find the fluid name. It is printed in the manual and often on the dipstick or a label. Write it down. Most maker atlas entries above name the fluid, and the wrong fluid or the wrong level is one of the ways a cheap service turns into a repair.

3. Look under the car where it parks. A fresh red, brown or pink spot under the middle of the car is a leak, and a leak is a level problem before it is a service problem. If you have a dipstick, read it as the manual says: many are read warm, engine running, in Park, on level ground.

4. Smell and look at the fluid, but do not judge by color alone. Burnt smell, metal glitter, or a brown milkshake look are reasons for a diagnosis. Dark color by itself is not. 🟢 GM's note PIP5295B on the 2014-2016 Spark EV says "DO NOT replace the Transmission, Transmission Cooler or recommend flushing the Transmission or Transmission Cooler based only on the appearance of the Transmission Fluid."

5. Check the reminder, not just the odometer. Some cars show a transmission fluid message, and the documents show it is not always right. 🟢 Acura's 16-063 changes the fluid for judder "even though the "ATF Service Due" message has not appeared", and GM's PI1300B for the 2012-2014 Captiva Sport and 2008-2009 Saturn VUE says that after a fluid change "there is no process to reset the oil life monitor to zero" and gives technicians a work-around with a Tech 2 scan tool. A message that is still on after a service, or never came on at 100,000 miles, is a question for the shop, not proof either way.

6. Read the codes and write down the symptom. A free scan at a parts store or your own reader shows the codes it can read; some transmission codes need a scan tool that reads the transmission module, so "no codes" from a basic reader does not clear the transmission. A code number turns "it feels funny" into a diagnosis. Then write one line: when it happens, at what speed, hot or cold. A shudder at a steady 25 to 80 mph and a slip on a hill after a stop are different problems, and only the first has a bulletin with a fluid fix in some vehicles.

7. Check for open campaigns and bulletins. Enter your VIN on the NHTSA recall page and ask the dealer to print the bulletin list for your VIN.

If the schedule says it is due and nothing else is wrong, you are on Route 3. If something else is wrong, keep reading before anyone connects a machine.

What a transmission fluid change costs in 2026: the price ladder

There are two kinds of numbers below. The owner figures are what people wrote in complaints to NHTSA, counted once per figure. The labor times come from the makers' own warranty labor operations, which show how long the job takes, not what a shop charges for an hour. We do not carry shop-estimate ranges: the estimator site we tried refused our check.

For comparison, what owners reported in the same complaints for diagnosis and repairs. These are not outcomes of a fluid change; they are what the same owners were quoted or paid for other transmission work.

The maker labor times behind those prices. 🟢 GM's level check in 15667 is 0.3 hour. Jeep's overfill correction in 21-011-15 is 0.7 hour, or 1.0 hour if the fluid has to be drained. Ford's level adjustment in 21B55 is 0.5 hour, 0.6 for a Bronco Sport. GM's 2019 Cadillac XT4 shudder bulletin 18-NA-378 lists 0.4 hour for the pan drain and fill that follows a torque converter and cooler replacement, and 18-NA-355 pays 1.1 hours for the machine exchange. Honda and Acura pay 1.4 hours for three drain-and-fills with a test drive. None of these is a price: ask the shop for its posted hourly labor rate and multiply, then add the fluid; a quote far above that is worth questioning.

Why a flush can cost less than a drain-and-fill on these figures. Most paid flush figures are $200 to $400. Four are around $400 (two say "over $400"), and the owners do not always say whether that bought one pass of a triple flush or all three. The paid drain-and-fill and "transmission service" figures include fluid corrections for a factory-fill or shudder problem, from $650 to $1,066.10, and one dealer bill well above the rest: $1,800 for a 2010 Rogue. Those are small samples, and they are what owners chose to mention, not a price survey.

How much does a transmission fluid change cost in 2026? In the 3,280 federal complaints PulsCar read, owners give 104 dollar figures for a fluid change, flush, exchange or top-up. The 57 they describe as paid or billed run from $97 to $1,800, with a median of $358 and a middle half of $249 to $500; the 36 quotes have a median of $500. A drain-and-fill or "transmission service" paid or billed has a median of $400, a flush or machine exchange $300. Maker labor times are short: 0.3 hour for a GM level check, 1.1 for GM's machine exchange, 1.4 for Honda's three drain-and-fills. The fluid is the rest of the bill: 3.3 quarts per Honda fill, 20 quarts loaded into GM's exchange machine. For comparison, the 232 figures for a replacement or rebuild in the same complaints, mostly quotes, have a median of $6,650.

Transmission fluid change cost: the five routes

The routes run roughly from nothing to pay to a diagnosis and possibly a repair. Each one has the same parts: what it is, what the makers' documents say, what owners report, the cheap cause that gets skipped, and what to say at the counter.

Route 1: "Lifetime" or "filled for life" fluid, and nothing is due

What it is. Your schedule prints no fluid change, or prints inspection only, and the car drives normally. The cost is $0 until the schedule, a severe-service line or a symptom says otherwise.

What the documents say. 🟢 Toyota and Lexus print inspection only for World Standard fluid at 100,000 miles, for normal service (check your own manual's towing and severe notes): "ATF-WS does NOT require any flushing or changing during the life of the vehicle." 🟢 Mazda's SA-079/24 calls SKYACTIV-DRIVE with ATF-FZ "filled for life" with "no change intervals for ATF required". 🟢 Volkswagen's 2019 schedule prints the 80,000-mile automatic fluid change for the United States, and next to it "(not applicable for Canada; Filled for life)": the same car, two schedules. 🟢 Audi's 2016 and 2017 schedules list fluid changes only for DSG and S tronic units, some Tiptronic hybrids and some differentials, and for a conventional automatic only a check for leaks. 🟢 Hyundai's Genesis bulletin shows the other side: no change under normal service, every 60,000 miles under severe service.

What owners report. 188 complaints are about lifetime or sealed fluid, a missing dipstick, or a long or missing interval: 69 use the word sealed, 65 mention a dipstick, and 19 the word lifetime. In 57 of them the transmission was replaced or replacement was recommended. A 2018 Toyota C-HR owner at 102,000 miles wrote: "At the time we purchased this vehicle new Toyota claimed that this transmission is sealed and maintenance free and the transmission fluid is "lifetime fluid". We have had the car for 8 years, quite short of a lifetime." A 2021 Silverado 1500 owner after an overheat on a mountain pass: "This model does not have a dip stick to check transmission fluid resulting in a $2500.00 drop an drain". Those are complaints from people who had a problem; they say nothing about how often lifetime fluid fails.

The cheap cause that gets skipped. Reading the severe-service line. Owners compare "lifetime" with the normal column and stop. If you tow, drive short trips or sit in traffic, your schedule may already call for a change, and a $0 route becomes a Route 3 drain-and-fill on your own terms rather than a repair later.

What it costs. $0 by schedule; a level inspection when the schedule calls for one.

At the shop — say this: "My manual lists inspection only for the transmission fluid under normal service. Before you sell me a flush, show me the line in the maker's schedule that calls for it at this mileage, or check my severe-service column with me."

Route 2: The level check, top-up or drain-down

What it is. The fluid is not wrong or worn; there is the wrong amount of it. Low from a leak or from the factory, or high after a service. It can be the cheapest fix on the ladder when it is a simple correction, and it is easy to get wrong when the level is set at a plug with a scan tool rather than on a dipstick.

What the documents say. The documents describe overfills as well as underfills. 🟢 GM's 15667 checks and adjusts levels on 16 U.S. vehicles of the 2015-16 model years, trucks, SUVs, Cadillacs and Corvettes, that "may expel extra transmission fluid out of a vent fitting and hose on the top of the transmission", with a temperature window: "TFT>45°C=under-filled, TFT<35°C=over-filled." 🟢 Jeep's 21-011-15 for 2014-2015 Compass and Patriot built in an 18-month window is titled "Transmission Fluid Overfill After Repair" and says the condition "may be due to an overfill condition after incorrect fill procedures". 🟢 Ford's Customer Satisfaction Program 21B55, for 2021-2022 Bronco Sport, Maverick, Escape, Corsair, Edge and Nautilus with the 8F35: "In some of the affected vehicles, the transmission may have been over filled with transmission fluid." It ran through September 30, 2022 and has expired. 🟢 BMW's B24 03 16 traced hybrid overheating warnings to an overfill "during the last fluid replacement service". 🟢 Honda's 23-074 for the 2017-19 Ridgeline: "NOTE: Overfilled transmission level can cause an overheat condition."

Underfill comes from the factory, too. 🟢 Subaru's WTJ-70 for 2017 non-turbo Foresters with CVT built February to August 2016: "The CVT fluid (CVTFII) in affected vehicles was not filled to the proper specified level at the factory." The fix: "Only 700ml of CVTFII is required per repair." 🟢 Chrysler's 21-046-15, for 2015 Grand Caravan and Town and Country minivans built in a three-day window in June 2015, checks the level for harsh shifts and pays dealers a "Transmission Fluid Check" "And Fill Handling Fee" of $5.00, a warranty payment to the dealer, not a price an owner pays. 🟢 Hyundai's 26-01-060H for some 2025-2026 Sonatas with the 2.5L describes "a transmission oil leak at the bottom of the valve body cover due to a loose oil level plug that could potentially lead to a total failure of the automatic transmission." 🟢 Kia's campaign SC363 for some 2025-2026 K5, Sportage and Carnival models: "The oil level plug in the subject vehicles may not have been installed properly during assembly."

What owners report. 356 complaints are mainly about the level or a top-up; 300 describe a top-up, level check or correction as a remedy or diagnostic step for an existing symptom, and 32 of those say it helped. Among the 79 complaints about the wrong fluid or a service done wrong, 15 use the word overfill or overfull. A 2011 Nissan Frontier owner: "I PAID 157.00 TO HAVE THEM TELL ME THAT MY TRANSMISSION WAS OVER FULL. THEY PULLED ABOUT 3 LITERS OF EXTRA FLUID FROM TRANNY." A 2013 Tacoma owner whose clunk began after a dealer flush drained the pan themselves: "ONLY 1 QT. CAME OUT, ADDED REQUIRED 3.2 QTS AS REQUIRED, SOLUTION RESOLVED". A 2014 Pathfinder owner without a dipstick says a check through the fill port costs about $1,100, and that draining, a new filter and seal and an exact refill cost more: "Our 3 cost estimates range from $1,400.00 to $1,850.00".

The cheap cause that gets skipped. The temperature. On plug-check transmissions, the level is only right inside a window read on a scan tool: 35 to 45 °C in GM's overfill bulletin and Subaru's WTJ-70, 50 to 60 °C in Jeep's and Hyundai's Genesis procedures, 104 to 115 °F in Honda's 9-speed B16120B, 80 °C in Honda's 23-074, 85 to 90 °C in Lexus's L-SB-0011-13 for the U660E/F in the 2007-2014 ES 350 and 2010-2014 RX 350, 170 to 180 °F with Nissan's CVT gauge in NTB18-055a. A level set cold or hot outside that window is wrong while looking right.

Fix it yourself. With a dipstick: warm the car, park level, read it as the manual says, add only the named fluid in small amounts. Without one: this is a lift-and-scan-tool job, and 🟢 Honda's B16120B warns why: "With the level plug removed, you must keep the engine running." GM's 15667 puts it in capitals: "THE ENGINE MUST BE RUNNING when the transmission fluid level check plug is" removed. If you do not have a lift and a scan tool that reads transmission temperature, pay for the check.

What it costs. Owners report $97 for a top-off at a shop and $157 for an overfill found and drained at a dealer; maker labor times are 0.3 to 1.0 hour.

At the shop — say this: "Before any flush, please check the level at the temperature in the service procedure and tell me what you measured. If it was over- or underfilled after the last service, I want that on the invoice."

Route 3: The scheduled drain-and-fill, with a filter or pan if the manual calls for one

What it is. Maintenance on a healthy transmission: drain, replace with the named fluid, a new filter and gasket where the design has one, and a level check at temperature. This is the route most schedules mean.

What the documents say. 🟢 Volkswagen's 2019 US schedule: 6-speed DSG fluid and filter every 40,000 miles, non-DSG automatic fluid every 80,000 miles. 🟢 Audi's 2016 US schedule lists the S tronic fluid and filter change for some models under "Perform first at 35,000 miles and thereafter every 40,000 miles."; later Audi schedules move some models to 80,000 miles. 🟢 Isuzu's IB07-K-001G, for N-Series commercial trucks with Aisin automatics, repeats the owner's-manual interval for fluid and external filter: "Auto Trans. Fluid 26,000 mi (41,600 km) 30,000 mi (48,000 km)". 🟢 MINI's 7DCT300 bulletin sets the dual-clutch oil change by a Check Control message "From 60,000 miles (95,000 km) to 78,000 miles (125,000 km)" or after six years. 🟢 Kia's TRA046 gives the fluid and capacity for every model it lists, for example 7.4 quarts for a 2020-25 Telluride. For the cooler flush after a transmission replacement it says "DO NOT use aftermarket transmission cooler flush products.", and it warns that "Use of the incorrect fluid can result in damage to the transmission." 🟢 Ford's SSM 47093 for the 10R80 names MERCON ULV. Mercedes-Benz, short of NAG3 fluid in 2026, lets dealers postpone routine changes, but "Published maintenance intervals remain unchanged."

What owners report. 1,004 complaints are mainly about a fluid change, drain-and-fill or "transmission service". In 371 of them it was routine maintenance, not a repair attempt; 63 of those say a problem followed that the owner describes as starting after the service, and in 99 the transmission was replaced or replacement was recommended at some point in the story. Every one of these owners had a problem, which is why they complained, and the replacements are not always tied to the service; the counts do not show that a drain-and-fill causes failure. In 633 the change was done or offered as a fix, and 120 say it helped. A 2010 Rogue owner: "THE DEALER CHARGED ME $1800.00 TO CHANGE DIRTY TRANSMISSION FLUID. PROBLEM IS BACK AGAIN AT 112,000 MILES."

The cheap cause that gets skipped. The fluid name on the invoice. A drain-and-fill is cheap insurance only with the fluid your manual names. Write the fluid on the work order before the job and check it on the invoice after. Kia, Hyundai, Mazda, Volkswagen, Infiniti and Subaru all print some version of "use only this fluid" in the documents we read.

Fix it yourself. On a car with a drain plug, a fill or check plug you can reach, and a level procedure you can follow, a drain-and-fill is a driveway job, with the car on ramps or jack stands on level ground and never on a jack alone, and with the fluid cool enough not to burn: measure what comes out, put back the same amount of the named fluid, then set the level by the manual's procedure, because putting back what came out is only right if the level was right before. Use the torque values in your own service manual; as an example of how specific they are, Honda's bulletins give 49 N•m for the drain plug and 44 N•m for the filler bolt, for the Honda units they cover only. If the car has a sealed plug-check design and you have no scan tool, do not start the job yourself: the level step is the part that goes wrong, so have a shop do the whole drain-and-fill.

What it costs. Owners who paid or were billed for a drain-and-fill or "transmission service" report a median of $400, with a middle half of $286 to $650; GM's 2019 XT4 bulletin adds 0.4 hour for a pan drain and fill.

At the shop — say this: "Drain-and-fill with the fluid named in my manual, new filter and pan gasket only if the schedule calls for them, and level checked at the specified temperature. Please write the fluid name and quantity on the invoice. No flush machine and no additives."

Route 4: A flush, machine exchange or triple drain-and-fill for a named shudder or judder

What it is. A fluid service used as a repair: the maker has traced a shudder, judder, harsh engagement or a warning message to worn or wrong fluid and prints a procedure to replace most of it with a named fluid. This is the route where a flush is the maker's own fix, and the route where the bulletin should be checked against your VIN first.

What the documents say. 🟢 GM's 18-NA-355 and 19-NA-121 tell dealers that "Vehicles that are presented with TCC shudder should have the appropriate fluid" exchange procedure, and 18-NA-355 warns first that "Sometimes shudder is not caused by the torque" converter clutch: it can be "fish bite, chuggle, surge or vibration.", GM's names for other shakes that feel like shudder but have other causes. The torque converter clutch is the part that locks the engine to the transmission at cruising speed; when it slips it can feel like driving over rumble strips. 19-NA-121 sets the owner's expectations: "It may take up to 200 mi (320 km) for the" shudder to go, over "a minimum of two cold to operating temperature drive cycles." 18-NA-355 says the exchange "should only be completed once". GM's dealer-inventory update N192217820 for about 3,800 unsold 8-speed Cadillacs of 2015-2019, 2017-2019 Colorados and 2018-2019 Canyons did the same fluid change before sale: "Dealers are to drain the old transmission fluid and refill with the new fluid." It expired August 31, 2020.

🟢 Honda and Acura do the same job without a machine: 16-063, 16-066, 23-073 and 23-074 drain and fill three times with 3.3 quarts of DW-1 each time, at 1.4 labor hours, after a software update. 23-074's reason: "ATF deterioration causes high foaming and low viscosity." 🟢 Mazda's 05-005/23 for a chirp in 2017-2024 CX-5, 2018-2021 Mazda6, 2019-2024 Mazda3 and 2020-2024 CX-30 models with cylinder deactivation replaces the torque converter and fills the fluid three times in all, because the chirp may be caused by fluid "contaminated by iron powder due to excessive wearing of the lock up clutch in the torque converter." Between fills: "Drive the vehicle at 20 mph for 3 minutes to agitate the ATF in the torque converter".

🟢 Audi's 37 16 64 for 2012-2014 A4, A5 Cabriolet and A6 with the 0AW transmission flushes twice before a module is replaced: "Before the TCM is replaced, the ATF must be completely flushed, and the ATF test run executed twice", because "There is a reaction between the TCM and the automatic transmission fluid (ATF) in vehicles within a specific VIN range." Even there the printed flush is a drain, fill and test run done twice; the bulletin does not mention a machine. 🟢 GM's own cooler flush, 17-NA-066: "Effective December 1, 2018, GM no longer requires a" "mandatory cooler flush and flow test to be performed in" every transmission or torque converter repair (U.S. warranty repairs on 2010-2019 GM vehicles).

What owners report. 731 complaints are mainly about a flush or exchange. In 569 it was a fix attempt, and 127 of those say it helped, often for a while; in 124 the transmission was replaced or replacement was recommended later in the story. GM vehicles account for 192 of the flush fix attempts, with 49 saying it helped; 90 of the 192 mention a shudder, and 25 of those say it helped; Honda and Acura account for 113, with 30 saying it helped. A 2020 Colorado owner: "had transmission flushed and changed fluid to new style transmission fluid, per GM under warranty." The dealer said a repeat would cost the owner "approximately $400- $500", and more than a year later "the truck is shuddering again at 48,700 miles." A 2019 Pilot owner after two dealer flushes: "The dealer has now recommended a triple transmission flush at a cost of approximately $1,000". A 2016 Corvette owner was told by the dealer that the fluid had to be replaced with a "new design" "at my expense for a total of $1,066.10."

The cheap cause that gets skipped. Confirming the cause. GM's 18-NA-355 says shudder is not always the converter, and Acura's ask for a data snapshot sent to the maker's technical help line before the flush. A fluid exchange done for something that only feels like converter shudder (GM lists fish bite, chuggle, surge or vibration) costs the same and fixes nothing. The other cheap cause is the coverage: these procedures were warranty labor for vehicles still under powertrain coverage, and owners in our pool paid for the same job after their dealer said it was out of coverage.

What it costs. Owners report a median of $300 paid or billed for a flush or exchange and a median quote of $500; maker labor is 1.1 hours for GM's exchange and 1.4 hours for Honda's three fills, plus up to 20 or 24 quarts of fluid for the GM procedure.

At the shop — say this: "Which bulletin covers this shudder on my VIN, and did you confirm it is the torque converter clutch and not a misfire or a mount? If the bulletin has been done before, show me where. If it is covered by powertrain warranty, I would like it billed there."

Route 5: The fluid is the symptom: wrong fluid, contamination, or a failing transmission

What it is. The fluid is telling you something: the wrong type is in it, coolant or metal is in it, or it burned because the transmission is slipping. A fluid service here does not fix the cause and can hide it for a while.

What the documents say. 🟢 GM's 17346 program for about 42,800 2014 Chevrolet Sparks corrected an owner's manual that may have listed the wrong fluid: "may have incorrect transmission fluid specified in the" manual; the program ended September 30, 2019. 🟢 Infiniti, Subaru, Honda, Kia and Mazda all print that the wrong fluid can damage the transmission, and Infiniti, Kia, Mazda and Volkswagen say that damage or that repair is not covered by warranty. Mazda in 05-001/18: "USING A GENERIC, MULTI-PURPOSE OR UNIVERSAL ATF MAY CAUSE TRANSMISSION DAMAGE."

Contamination has its own documents. 🟢 Honda's warmer bulletins 17-026 (five listed 2016-17 MDX VINs) and 17-027 (2015-16 TLX with the 9-speed) describe coolant and fluid mixing in the 9-speed's warmer: "If the fluids have cross-contaminated, the color will be brown, and the consistency will be similar to a milkshake." and "Not all cases of cross-contamination are visible". For vehicles with a listed symptom and a failed warmer pressure test, Honda extended the warmer warranty "to 10 years from the original date of purchase with unlimited mileage." 🟢 Allison's SIL 18-TR-98 on water and glycol, for commercial transmissions: "Glycol contamination will physically deteriorate clutch plate material." 🟢 GM's 9-speed bulletin 18-NA-378 for the 2019 Cadillac XT4 tells technicians to check whether the fluid is contaminated with engine coolant and, if it is, replace the transmission and the cooling exchanger.

What owners report. 79 complaints are about the wrong fluid or a service done wrong: 23 name a wrong, incorrect or improper fluid, 14 mention the factory or an assembly plant, and 58 a dealer. A 2017 Sierra 1500 owner: "Im paying $900 to correct the problem." Flushes before a failure are a recurring story: a 2012 Quest owner with slipping on hills asked about preventive maintenance and paid $125 for the flush the dealer recommended; less than a month later the slipping still occurred, and the dealer later "CONFIRMED TRANSMISSION NEEDED TO BE REPLACED TO TUNE OF $4100." A 2020 Elantra owner, after a dealer flush: "22 hrs later, the transmission died while my daughter was driving it." Owners who give a figure for a replacement or rebuild report a median of $6,650 across 232 figures, most of them quotes; the 30 paid or billed have a median of $5,175.

The cheap cause that gets skipped. A fluid sample and a code read before anything else. A sample in a clean jar, a look for glitter, a smell, and the stored codes cost little or nothing and tell a shop whether it is looking at maintenance or a failure. A flush on a slipping transmission is the most expensive way to find out.

What it costs. A diagnosis, which owners report at a median of $150 across 45 figures; then whatever the diagnosis finds, from a part or module (median $1,772 across 51 figures) to a replacement or rebuild.

At the shop — say this: "Please don't flush it yet. I'd like the codes, a fluid sample and a road test first, and a written diagnosis. If coolant or metal is in the fluid, tell me before any service, and check my VIN for warmer, cooler or fluid campaigns."

Drain-and-fill or flush: what the complaints and the documents show

The documents lean one way. Of the makers whose documents we read, Honda and Acura, Volkswagen, Mazda and Allison print a warning or a limit on flush machines or flushing, Kia requires a flush only when a transmission is replaced and its cooler moved to the new unit, and Toyota prints no change at all for WS fluid. GM is the main maker that uses an exchange machine in its own procedure, with one named fluid, once, for a shudder the owner reports; the dealer diagnoses further only if it returns, so describe the symptom precisely and ask whether it matches the bulletin. Ford names an exchanger process for its Police Interceptors. Where makers want more of the old fluid out, they mostly repeat the drain-and-fill: Honda three times, Mazda three times, Audi twice with a test run, and GM three times on the CT6 and Corvette.

The complaints do not settle it. Among routine services on transmissions that were not yet complained about, 50 of 162 flushes and 63 of 371 drain-and-fills or changes are followed by a problem said to start after the service. Among fix attempts, 127 of 569 flushes and 120 of 633 changes are said to have helped. Those numbers come from people who chose to complain to a safety regulator, so they lean toward bad outcomes and tell you nothing about how often either service goes wrong.

Is a transmission flush better than a drain-and-fill? Not on what most makers print, and owner reports are mixed. In the 546 manufacturer documents PulsCar read, the makers who want more old fluid out mostly repeat a drain-and-fill: Honda and Acura three times with 3.3 quarts each, Mazda three times after a torque converter repair, Audi twice with a test run. Honda strongly recommends avoiding aftermarket flush systems, Volkswagen does not support or warrant flush machines, and Allison, for commercial units, does not recommend exchange machines. GM is the main exception: its exchange tool and one named fluid for converter shudder, done once; Ford names an exchanger for some Police Interceptors. In the 3,280 complaints we read, 50 of 162 routine flushes and 63 of 371 routine changes are followed by a problem said to start after the service. Those are complaint counts, not failure rates; the safest choice is your transmission's printed procedure.

The coverage file: programs, campaigns and recalls that pay for fluid work

Fluid work is sometimes paid by the maker, but only for the vehicles, dates and conditions printed. Status "as of September 2026" below is our computation from each document's own terms.

🟢 Mercedes-Benz recall 21V539 is the plainest example of a prior repair with the wrong parts becoming a safety defect, for 371 vehicles: the wrong overflow pipe and filter "might have been installed by an authorized Mercedes-Benz dealer while performing a prior repair", the transmission can be overfilled, fluid can leave through the vent, and "A risk of fire cannot be ruled out". The remedy is a fluid and filter change with the right parts. 🟢 Ram recall 22V835 covers fluid expelled from the dipstick tube, which "may come in contact with ignition sources"; NHTSA's acknowledgement lists 248,342 potential units. Its first remedy installed a short locking dipstick, and a Mopar service note said this "removes a service check from under the hood, making the transmission sealed"; the March 2023 revision replaced it with a full-length locking dipstick and tube. 🟢 Ram recall 20V043 includes a pan drop and "Add approximately 5 Quarts of MOPAR® ATF+4 Automatic Transmission Fluid". 🟢 Lamborghini 22V220 and Audi 22V225 cover gearbox oil that may be too low on two sports-car gearboxes, Lamborghini's "due to a supplier mistake"; Audi's circular reads "Check and, if necessary, adjust gearbox oil level".

What 3,280 complaints show

We searched every complaint NHTSA received from 1 January 2015 to 4 October 2026, 782,908 records, for narratives that describe a transmission fluid change, flush, exchange, drain-and-fill, top-up, level check, wrong fluid, or lifetime or sealed fluid. The first search found 3,002. A separate completeness check found 278 more, using wording the first search missed, such as a transmission "serviced" without the word fluid, "had it flushed" with the transmission named elsewhere, or "too much" and "a quart low". Every one of the 3,280 was sorted twice, independently, by the same written rules, which were fixed before the sorting started. The two sortings matched on 2,939 of the first 3,002 (98%) and 260 of the 278 added by the check (94%). Disagreements were settled under written rules, published with the sorting rules.

2,719 complaints were about a fluid service or fluid question on the owner's own vehicle; 561 mentioned fluid in passing or were about something else. The 2,719 by main category: 1,004 a fluid change, drain-and-fill or "transmission service"; 731 a flush or exchange; 361 a fluid service recommended, quoted or refused; 356 a level check or top-up; 188 lifetime or sealed fluid, no dipstick or no interval; 79 the wrong fluid or a service done wrong. In 1,788 a fluid service was done, recommended or quoted as a remedy for a symptom that already existed; 289 of those say it helped. Across all 2,719, 241 say something got worse after a service and 628 that the transmission was replaced or replacement was recommended.

Makes and models. By make: Ford 539, Chevrolet 382, Honda 363, Nissan 360, GMC 183, Toyota 148, Jeep 107, Dodge 83, Hyundai 82, Acura 56, Subaru 48, Kia 47. By model: F-150 162, Silverado 1500 114, Pilot 110, Escape 100, Sierra 1500 88, Odyssey 66, Pathfinder 64, Colorado 63, Altima 62, Rogue 61. These are counts of complaints, which follow how many of each vehicle are on the road and how their owners complain. They are not failure rates and do not rank reliability. The median model year is 2016, and the 1,252 complaints that give a mileage between 1,000 and 400,000 have a median of 85,000 miles. Complaints received rose to 387 in 2025, and 372 in 2026 through 4 October.

What the narratives mention. The word dealer or dealership appears in 1,648 of the 2,719, which says more about where people take a transmission than about who does fluid work badly. Shudder (or the misspelling shutter) appears in 398, a CVT in 206, metal shavings, flakes, particles, debris or fragments in 76, and burnt (or burned fluid) in 57. The final codes mark a fluid service followed by a new or worse problem in 241 complaints; about half of those services were done as a fix for a symptom that was already there.

What do federal complaints say about transmission fluid changes? PulsCar read all 3,280 NHTSA complaints received from 2015 to 4 October 2026 about a fluid change, flush, top-up, wrong fluid or lifetime fluid, each sorted twice, independently, by the same written rules. Of the 2,719 about the owner's own vehicle, 1,004 center on a drain-and-fill or "transmission service", 731 on a flush or exchange, 356 on a level check or top-up, 188 on lifetime or sealed fluid, and 79 on the wrong fluid or a service done wrong. In 1,788 a fluid service was done, recommended or quoted as a remedy for an existing symptom, and 289 of those say it helped. Owners who wrote down what a fluid service cost report a median of $358 paid or billed. These are counts from people who complained to a regulator, so they show what goes wrong and what it cost, not how often a fluid service fails.

Why the problem comes back after a fluid service

The fluid was not the cause. A fluid service on a slipping clutch pack or a failing converter can change the friction for a while. GM's note in 18-NA-355 that shudder is sometimes not the converter, and Acura's snapshot before a flush, exist for this reason.

Only part of the fluid was replaced. A single drain-and-fill leaves old fluid in the converter and passages, as Mazda's 05-005/23 says; Honda, Mazda and GM print three fills or a measured exchange for these jobs, and GM's 19-NA-121 says that intermixing other fluids or additive packages in its exchange "will not provide satisfactory results."

The wrong fluid or the wrong level. The 79 complaints about a service done wrong include the wrong factory fill and overfills after a service. Ford's 21B55 lists what an overfill does: "transmission fluid aeration, degraded shift quality in the vehicle, accelerated wear on bushings and bearings, and reduced cooling in the transmission".

The fluid ages again. Honda's 16-063 says that after the software update the judder may return because the fluid has deteriorated, and 23-074 that deterioration causes foaming and low viscosity. Neither says a fluid change is temporary, but both are reasons to ask about the severe-duty interval.

Can you keep driving?

Yes, if a routine service is simply due. With no symptom and no warning, book the service; the documents print intervals, not a safe delay, and severe-duty intervals are shorter.

Book it now, for a shudder that a bulletin names. Owners in our pool drove for months with a shudder before the fluid exchange, and some of them told NHTSA they considered it a safety concern. The bulletins list it as a condition to repair, not a stop-driving warning; book the repair, and if it comes with a warning light, slipping or loss of power, treat it as the next case.

Only straight back to the shop, if the level is in doubt after a service. A new clunk, slip, flare or warning after a fluid service is a reason to go back before you put miles on it. The Tacoma owner above, whose clunk began after a dealer flush four months earlier, got only 1 quart out of the pan and added the 3.2 quarts they said were required; the Frontier, which the owner says had never had fluid added, held about 3 liters too much. In both, a level check found the problem, so check the level even on a car that has never been serviced. If it slips or a warning comes on, stop and have it towed back.

No, for these. Smoke, a burning smell, or fluid pouring from a vent or dipstick tube: pull over, switch the engine off, get everyone away from the car and do not restart it; the Mercedes-Benz and Ram recalls above tie expelled fluid to a fire risk. Have it towed. A transmission temperature warning: pull over and let it cool; Ram's recall letter for 2019-2020 heavy-duty pickups told owners that if the transmission temperature passes 210 °F, they should park and let it cool, and Honda's 23-073 and 23-074 exist because of a "Transmission Temp Too Hot" message. If the warning returns, or the car slips or will not drive, have it towed rather than driven. Milky fluid: do not drive it; coolant in the transmission needs a diagnosis.

Should you buy a used car with no record of a transmission fluid change?

Read the schedule for that exact car first. If it says inspection only under normal service, a missing record is not a red flag; if it called for a change at 40,000 or 60,000 miles and the car is past that with no record, price in a drain-and-fill.

Ask for the fluid name on any record you are shown. An invoice that says "trans flush" with no fluid named is weaker than one that says the maker's fluid and quantity.

On a test drive, look for the bulletin symptoms. A shudder at a steady 25 to 80 mph in a GM 8-speed, a judder in an Acura MDX after a software update, a harsh shift in a Honda 9-speed, a chirp in a Mazda with cylinder deactivation. Ask whether the bulletin was done; the dealer can print the history by VIN.

Ask how the last level was set. On a transmission with no dipstick, a recent "service" by a shop without the scan-tool procedure can leave it over- or underfilled, and the documents above show both ending in harsh shifts, overheating warnings or leaks. A pre-purchase inspection at a shop that can read transmission temperature and check the level at the plug is worth more on these cars than a clean-looking dipstick is on older ones.

Run the VIN. Open recalls and the campaigns above follow the car, not the owner.

What to do before an inspection, a sale or a trade-in

Do not flush a transmission just before an inspection or a sale. If the car has a symptom, a fresh flush can mask it for a while and then the buyer finds it, or the symptom gets worse in the meantime. If the car is due for a drain-and-fill by its schedule, do it with the named fluid and keep the invoice.

Fix any leak and set the level. A wet transmission case or a drip under the car is what an inspector sees. Ford's 21B55 tells dealers to clean residual fluid around the vent and pan "to prevent a false sign of leak".

Bring the paper. The fluid name and quantity, the bulletin numbers done, and any campaign letters. That is what a buyer or an inspector can check.

Three traps that turn a fluid change into a repair bill

Trap 1: the flush sold on color. A tech shows you a dark sample and sells a flush. Dark fluid can be normal: in a note on the Spark EV's transmission, GM tells its own technicians not to recommend a flush based only on the fluid's appearance. Ask what the maker says for your model. Ask for a smell test, a level reading and a code read, and judge by the schedule and the symptom.

Trap 2: the universal fluid. A quick-lube machine with one "multi-vehicle" fluid. Volkswagen does not support or warrant aftermarket universal fluids or the machines used to flush transmissions, Mazda says a generic or universal fluid may cause damage, Hyundai does not approve additives, and Mazda and Infiniti say damage from the wrong or a generic fluid is not covered, and Kia that damage from an improper repair is not covered. Name the fluid on the work order.

Trap 3: paying twice for the maker's procedure. The shudder exchange or the triple drain-and-fill is printed in a bulletin and was billed to powertrain warranty for vehicles still under that coverage. Owners in our pool were told a repeat would be on them; GM's 18-NA-355 says it should be done only once. Ask whether your VIN is in warranty, whether the bulletin was done before, and get the answer in writing.

Three composite scenarios

These are composite scenarios, not individual customers. Each one combines patterns from several complaints and the documents above.

The truck with a shudder. A 2018 pickup with an 8-speed shudders at a steady 45 mph. A quick-lube quotes a flush with its universal fluid. The owner has the codes read (none stored), finds the bulletin family by model, and asks the dealer whether the fluid exchange applies to the VIN and whether it was done. The dealer confirms the symptom matches the bulletin. The truck is past its powertrain coverage, so the owner pays the bulletin's labor time and fluid, asks in writing for goodwill (a maker paying some of a repair outside warranty, at its discretion), and is told it may take up to 200 miles to settle.

The crossover with "lifetime" fluid. A 2016 crossover at 95,000 miles, towing a small trailer every summer. The schedule says inspection only under normal service, but the severe column calls for a change. The owner has a drain-and-fill done with the named fluid and the level set at temperature, pays the menu price, and keeps the invoice with the fluid name on it.

The car that slips after a flush. A 2014 sedan with a CVT slips on hills. A shop sells a flush "to save it". A week later it slips worse. The owner gets a code read, a fluid sample and a written diagnosis, finds the CVT is failing, and gets quotes for a replacement. The flush did not fix the slipping; it delayed the diagnosis and added a bill.

CVT, dual-clutch or conventional automatic: three different fluid jobs

The word "transmission" on a quote hides three designs, and the documents treat them differently.

A conventional automatic (torque converter and planetary gears) is what most of the bulletins above cover: GM's 8-speeds, Honda's 6-speed and 9-speed, Toyota's WS units, Mazda's SKYACTIV-DRIVE, Ford's 10R80 and 8F35, Kia's and Hyundai's 6- and 8-speeds. Fluid service here means a drain-and-fill, sometimes a filter, a level set at temperature, and in some shudder cases the maker's exchange or repeated fill. 🟢 Honda's B16120B gives the reason the level matters so much on its 9-speed: "In a 9-speed A/T, the ATF level is critical. If it’s too high, the transmission could shift hard."

A CVT uses its own fluid, and the makers are blunt about it. 🟢 Infiniti says ordinary ATF or manual transmission fluid can damage its CVT, Subaru that its two CVT fluids cannot be interchanged, Nissan sets the level from the bottom of the CVT with a gauge at temperature, and GM's 17346 program existed because a 2014 Spark manual specified the wrong transmission fluid; the corrected page names a CVT fluid. In our pool, 206 complaints mention a CVT: 94 are mainly about a fluid change, 37 a flush, 25 a fluid service recommended or refused, 25 lifetime or sealed fluid, 19 a level or top-up and 6 the wrong fluid. A 2013 Civic owner paid for a flush that did not help: "I SPENT $149 FOR A FLUSH THAT DID NOTING TO ALLEVIATE THE NOISY AND ROUGH TRANSMISSION ISSUE".

A dual-clutch (DCT, DSG, S tronic) often has its own oil, its own filter and its own interval, separate from the engine and sometimes from the rest of the gearbox. 🟢 Volkswagen's US schedules change 6-speed DSG fluid and filter every 40,000 miles; MINI's 7DCT300 waits for a Check Control message between 60,000 and 78,000 miles or six years; Kia's TRA093 for the 2019-2020 Niro hybrid's 6-speed DCT inspects for shift impact or noise and, if found, replaces the oil: "Required amount: 1.6 - 1.7 L". 🟢 Honda's B14070E warns that the red dual-clutch fluid and the golden-green 9-speed fluid must never be mixed. A shop that treats a DCT like an automatic, or tops a CVT up with ATF, has turned a routine service into Route 5.

Towing, heavy-duty pickups and severe service

Severe service is where "lifetime" ends. Hyundai's Genesis bulletin is the clearest passenger-car example: nothing under normal service, every 60,000 miles under severe. Heavy-duty documents go further.

🟢 Allison's SIL 10-TR-99 Rev. CC, for its commercial 1000 and 2000 Series, prints a fluid change at 150,000 miles under general duty and 75,000 miles under severe duty with its TES 668 or TES 295 fluids, and 50,000 and 12,000 miles with TES 389 fluids, all with prognostics off and each with a months or hours limit, whichever comes first (48 and 36 months for TES 668 and 295, 24 and 6 for TES 389). It adds that "Allison Transmission recommends that customers use fluid analysis as the primary method for determining fluid change intervals." Those are commercial-truck intervals, not a passenger-car schedule, but they show how much the duty changes the answer: the same unit, half the interval or less.

🟢 The owner's-manual level check reprinted in Ram's recall 22V835 for 6.7L pickups with the 68RFE shows what a correct check looks like on a dipstick transmission: "It is best to check the fluid level when the transmission is at normal operating temperature (158-176°F / 70-80°C). This normally occurs after at least 15 miles (25 km) of driving." Then idle for at least 60 seconds, read between the hot holes, "Do not overfill.", and wait "a minimum of two minutes" after adding before checking again.

What owners report. Pickups are near the top of the model counts: the F-150 (162) and Silverado 1500 (114) are first and second, the Sierra 1500 (88) fifth and the Colorado (63) eighth. Many of them describe the shudder, shift and fluid stories above; those are counts of complaints, not a reliability ranking. If you tow, plan on the severe column of your schedule, and check the level the way your manual describes after a long pull, not cold in the driveway.

What owners paid, case by case

A sample of the 104 fluid-service figures and 5 level-check figures, each from a complaint you can find by its ODI number in the published amounts file. Status is what the owner wrote: paid, billed, quoted, or not stated.

The spread is the point. In this table a fluid service runs from $97 for a top-off at a shop to $2,500 for a "drop and drain" with no status stated, and several of the higher figures are fluid services done as a repair for a shudder or a factory-fill problem. Read the quote for what it includes before you compare the number.

What a good invoice for a transmission fluid service shows

Six lines separate a fluid service you can check from one you have to trust.

1. The job by name: level check, drain-and-fill, filter and pan, exchange, or the maker's bulletin procedure, with the bulletin number.
2. The fluid by name and quantity, matching your manual: ATF DW-1, ATF-WS, NS-3, CVTF II, MERCON ULV, ATF+4 or whatever yours says, not "ATF" or "multi-vehicle".
3. The level temperature, or the scan-tool reading at which the level was set, for any transmission without a dipstick.
4. The filter and gasket, only if the schedule calls for them.
5. The codes and the road test, if the service was for a symptom: what was stored before, what was found after.
6. Who pays, if a bulletin or campaign applies: warranty, goodwill or customer pay, in writing.

If a shop will not write the fluid name on the invoice, that is the answer to whether you should let it touch the transmission.

Your plan, in order

1. Read your schedule's normal and severe columns and write down the fluid name.
2. Do the 10-minute check: spot under the car, level if you can read it, smell, codes, one line on the symptom.
3. Run your VIN for recalls and ask a dealer for the bulletin list.
4. Pick the route. Nothing due and no symptom: Route 1. Wrong level: Route 2. Due by schedule: Route 3, a drain-and-fill with the named fluid. A shudder a bulletin names: Route 4, the maker's procedure. Slipping, metal, milky or wrong fluid: Route 5, diagnosis first.
5. Get the fluid name, quantity and level temperature on the invoice.
6. Keep the paper, and if a symptom follows a service within days, go back to the same shop first and in writing.

How we did this

Complaints. We searched all 782,908 NHTSA complaints received from 1 January 2015 to 4 October 2026 with regular expressions for transmission words near fluid, service, flush, exchange, drain, fill, level, top-up, dipstick, lifetime and sealed wording, with a filter that drops dashboard messages such as "service transmission" lights. That found 3,002 complaints. A separate completeness check ran its own patterns and added 278. Every complaint was read in full and sorted twice, independently, by the same written rules, which were fixed before the sorting. Each received one category and four flags: fix attempt, helped, worse after, transmission replaced or recommended. Disagreements were settled by written rules; a final pass then checked the agreed sortings against those rules. The rules and every sorted complaint are published.

Money. Every dollar figure in the relevant complaints was decided under one rule: kept if the owner ties it to a transmission job on their own vehicle, with the narrative saying or implying whether it was paid, billed, quoted or offered (55 of the 522 are marked not stated); dropped if it is a car price, a mileage or a figure for something else. 522 figures in 410 complaints survived, each grouped by what it was for.

Documents. We downloaded every manufacturer communication in NHTSA's index that matched transmission fluid type, fill or level procedures, service intervals or flushing, plus the 94 the audit added, and the recall files for five campaigns where the fluid is the defect or the remedy. Byte-identical copies were removed, near-duplicates were grouped, one representative of each group was read in full and the rest were read as differences against it. Every quotation in this guide was checked word for word against the document text by script. The documents file lists each one with its link.

Limits. Complaints come from people who chose to write to a safety regulator. They over-represent bad outcomes and cannot give a failure rate or a typical price. Owner figures are what owners wrote, not invoices we saw. Coverage status is our computation from each document's printed terms, as of September 2026, not a statement from the maker.

Sources and documents

Manufacturer documents are listed by the number printed on them, with a link to the copy on NHTSA's servers. The full list of the 546 distinct documents we read, with relevance and duplicates, is in the documents file.

Honda and Acura

1. 16-063, 2012-15 MDX torque converter judder, three-fill ATF flush, version of September 28, 2018
2. 16-066, 2012 RL and 2014-17 RLX judder, warning against aftermarket flush systems
3. 23-073, 2016-20 Pilot "Transmission Temp Too Hot", software and three-time flush
4. 23-074, 2017-19 Ridgeline, same procedure, overfill warning
5. B16120B, ServiceNews, 9-speed level check without a dipstick
6. B14070E, ServiceNews, dual-clutch and 9-speed fluids not compatible
7. 17-026 and 17-027, 9-speed warmer warranty extension, listed 2016-17 MDX VINs and 2015-16 TLX

GM 8. 16-NA-175, 8L90 and 8L45 shake or shudder flush, version 10 9. 18-NA-355, shudder at 25 to 80 mph, fluid exchange once, version 6 10. 19-NA-121, 2019 Silverado and Sierra 1500 fluid exchange 11. N192217820, dealer-inventory fluid change, expired August 31, 2020 12. 15667, transmission overfill, level check at 35 to 45 °C 13. 17-NA-066, cooler flush no longer mandatory from December 1, 2018 14. 18-NA-378, 2019 XT4 shudder, coolant contamination check, pan drain and fill labor 15. PIP5295B, Spark EV fluid color, no flush on appearance alone 16. PI1300B, Captiva Sport and Saturn VUE transmission oil life reset after a fluid change 17. 17346, 2014 Spark owner's manual wrong fluid, ended September 30, 2019

Toyota, Lexus, Mazda, Nissan, Infiniti, Subaru 18. T-SB-0006-11 and L-SB-0001-11, WS fluid inspection only 19. L-SB-0011-13, Lexus U660E/F WS level adjustment at 85 to 90 °C, 2007-2014 ES 350 and 2010-2014 RX 350 20. SA-079/24, Mazda ATF-FZ, filled for life, flushing not recommended 21. 05-001/18, Mazda fluid application, flush only when instructed 22. 05-005/23, Mazda chirp, torque converter and three fluid replacements 23. NTB18-055a and NTB18-055E, Nissan CVT fluid level quick check gauge 24. ITB14-040, Infiniti CVT fluid NS-3 only 25. WTJ-70, 2017 Forester CVT factory underfill 26. Subaru CVTF parts announcement, March 2013, CVT fluids not interchangeable

Hyundai and Kia 27. 19-AT-011H, Genesis and Equus 8-speed level and severe-service interval 28. 21-AT-006H, Hyundai approved fluids, no additives 29. 26-01-060H, 2025-2026 Sonata loose level plug, campaign LA15 30. TRA046 Rev 5, Kia fluid application guide, flush only with a replaced transmission 31. SC363, Kia level plug campaign, 201 vehicles: 2025-2026 K5 and Carnival, 2026 Sportage 32. TRA093, 2019-2020 Niro 6-speed DCT oil replacement

Ford, Stellantis 33. 21B55, 8F35 overfill program, ended September 30, 2022 34. SSM 47093, 10R80 fluid MERCON ULV 35. SSM 47547, Police Interceptor transmission fluid exchanger process 36. 21-011-15, 2014-2015 Compass and Patriot overfill after repair 37. 21-046-15, 2015 Grand Caravan and Town and Country low fluid level

Volkswagen, Audi, BMW, MINI, Mercedes-Benz 38. 2019 Volkswagen maintenance schedule 39. 37-18-02, Volkswagen transmission fluid requirements, no universal fluids or flush machines 40. 2016 Audi US maintenance schedule 41. 37 16 64, Audi 0AW double ATF flush before module replacement 42. SI B24 03 16, BMW ActiveHybrid overfill after fluid service 43. SIM 28 01 23, MINI 7DCT300 oil service by Check Control message 44. LI27.00-P-080840, Mercedes-Benz NAG3 fluid shortage, intervals unchanged

Heavy-duty 45. SIL 10-TR-99 Rev. CC, Allison fluid and filter change recommendations 46. SIL 18-TR-98 Rev. C, Allison water and glycol in transmission fluid 47. IB07-K-001G, Isuzu Aisin automatic service reminder

Recalls 48. 21V539, Mercedes-Benz 2013 GLK250 BlueTec, overflow pipe and fluid filter 49. 22V835, Ram 2500 and 3500 6.7L, fluid expelled from the dipstick tube 50. 20V043, Ram 2500 and 3500 68RFE valve body separator plate 51. 22V220, Lamborghini Huracan gearbox oil quantity 52. 22V225, Audi R8 gearbox oil level

Complaints and data 53. NHTSA complaints database, received 1 January 2015 to 4 October 2026, 782,908 records; the 3,280 complaints we went through, the owner-reported amounts, the sorting rules and how we did it, published under CC BY 4.0.

Related guides: transmission repair cost, transmission slipping, transmission fluid leak, P0700, P0741 and oil change cost.

Prices verified October 2026: the owner figures were rechecked against the complaint texts; the estimator site we tried for shop ranges refused our check (HTTP 403), so no shop-estimate ranges are carried in this guide.

Technical documents verified October 2026 against the manufacturer documents on NHTSA's servers listed above, read in full or as differences against a document read in full.