Transmission Fluid Types: Dexron, Mercon, ATF+4, Honda DW-1, Toyota WS and CVT

There is no single “normal” transmission fluid. Each automaker writes its own specification, and the main ones in the US are GM Dexron (Dexron VI and Dexron ULV today), Ford Mercon (Mercon V, LV and ULV), Chrysler Mopar ATF+4, Toyota WS, Honda DW-1, and a separate family of CVT fluids. The right fluid for your car is the one named in your owner’s manual, often also printed on the dipstick or fill cap. Using the wrong type can cause harsh or slipping shifts and, over time, transmission damage.

What Transmission Fluid Does

Automatic transmission fluid (ATF) is far more than a lubricant. In a conventional automatic it is also the hydraulic fluid that operates the clutches and bands, the medium that transfers power through the torque converter, and the coolant that carries heat away from the gearbox. Its friction properties are tuned so that clutch packs engage smoothly without slipping.

That is why specifications differ. Each transmission design needs a particular balance of viscosity, friction modifiers and heat resistance, and automakers test fluids against their own standards. A fluid that is excellent in one transmission can shift badly in another.

Transmission Fluid Types by Automaker

Specifications change over time, and some models inside a brand use a supplier’s transmission with its own fluid. Treat the table as a guide to what the names mean, not a substitute for your manual.

Dexron VI Explained: Compatibility, Synthetic or Not, and Price

Dexron VI is GM’s automatic transmission fluid specification for most GM automatics built since about 2006, and it is one of the most widely sold ATFs in the US.

• Backward compatible in GM transmissions: GM approves Dexron VI for older GM automatics that originally called for Dexron II or Dexron III, so you can use it when topping up or changing fluid in those units.
• Not the same as Dexron III: Dexron VI is a thinner, longer-lasting fluid with tighter friction and shear-stability requirements. GM no longer licenses Dexron III, so bottles described as “Dexron III type” are made to the old spec without current GM approval.
• Not always full synthetic: the specification sets performance, not the base oil. Some Dexron VI fluids are full synthetic and some are synthetic blends, so read the label if you want full synthetic.
• Not universal: Dexron VI is not a substitute for Dexron ULV in GM 10-speeds, for Mercon LV, Toyota WS, Honda DW-1, or any CVT fluid unless the bottle names that exact specification as well.
• Price: retail listings in October 2026 ran roughly $9 to $16 a quart, with six-quart cases bringing the per-quart price toward the low end. Many cars need 4 to 6 quarts for a drain-and-fill.

Some newer GM 8-speed automatics have been serviced with an updated GM fluid sold under a separate name, and Honda’s 9- and 10-speed automatics use Honda fluids other than DW-1. In both cases the fluid printed in the owner’s manual or given by a dealer parts counter for your VIN is the one to trust.

Other Common Specs: Hyundai, Kia, European Cars and Heavy-Duty Trucks

The big domestic and Japanese names get most of the attention, but many popular vehicles use other fluid specifications:

European and luxury vehicles are the most likely to need an exact factory approval. When in doubt, a dealer parts counter can look up the fluid by your VIN.

CVT Fluid Is Its Own Category

A continuously variable transmission (CVT) uses a steel belt or chain running between two variable pulleys instead of fixed gears. The fluid has to create controlled friction between that belt and the pulleys, which is the opposite of what ATF is designed to do. That is why CVT fluid and ATF are never interchangeable.

• Nissan: NS-2 or NS-3 depending on the model and year
• Honda: HCF-2 in most current CVT models
• Toyota: CVT Fluid FE or TC depending on the model
• Subaru: Subaru High Torque CVT fluid or the grade listed for your model

Many “universal” CVT fluids exist, but automakers generally recommend their own fluid, particularly while the car is under warranty.

Dual-Clutch and Manual Transmission Fluids

Dual-clutch transmissions, such as Volkswagen DSG units and some Hyundai and Ford gearboxes, use dedicated DCT fluids because their clutches behave differently from both automatics and CVTs. Manual gearboxes vary widely: many use gear oil such as 75W-90, others use a dedicated manual transmission fluid, and some Honda and GM manuals were designed for ATF. If you drive a stick, our guide to driving a manual car covers the basics, and the manual will name the gearbox fluid.

How to Find Out Which Transmission Fluid Your Car Needs

1. Check the owner’s manual: look under specifications or capacities for “automatic transmission fluid” or “CVT fluid.”
2. Look at the dipstick or fill cap: many cars have the fluid type stamped on the handle, such as “Dexron VI” or “ATF+4 only.”
3. Ask a dealer parts counter: give them your VIN and they can tell you the exact fluid and capacity.
4. Read the bottle carefully: the label should name your specification directly, not just claim to be “compatible with most vehicles.”

Many newer cars have sealed transmissions with no dipstick at all, which means the fluid is checked and topped up through a fill plug, usually by a shop. Our guide to checking your car’s fluids explains which ones you can check at home.

Is Multi-Vehicle ATF Safe to Use?

Multi-vehicle or universal ATF is blended to meet the needs of several older specifications at once. It is a reasonable choice for many older conventional automatics, especially those that called for Dexron III or Mercon.

It is a poor choice for modern low-viscosity fluids such as Mercon LV, Dexron ULV, Toyota WS and Honda DW-1, and it should never go into a CVT or dual-clutch transmission. If the bottle does not name your exact specification as approved or licensed, choose a fluid that does.

Synthetic vs Conventional Transmission Fluid

Most modern ATF specifications, including Dexron VI and Mercon LV, are met by synthetic or synthetic-blend fluids, so the choice is usually made for you. Synthetic fluid resists heat breakdown better, which matters if you tow, drive in heavy traffic or live somewhere hot. For an older transmission that calls for a conventional fluid, a synthetic that meets the same specification is generally fine.

What Happens If You Use the Wrong Transmission Fluid?

• Harsh, delayed or flaring shifts as clutches engage at the wrong rate
• Shudder or judder, especially in torque converters with lock-up clutches
• Slipping, overheating and faster clutch wear
• Seal problems in some older transmissions
• In CVTs, belt slip and serious internal damage

Transmission Fluid Colors

New ATF is usually dyed red so that leaks are easy to tell apart from engine oil or coolant, although some newer and CVT fluids are green, blue, amber or nearly clear. In use, fluid darkens gradually. Dark brown fluid, a burnt smell or visible particles are signs that the fluid is worn and the transmission should be inspected. If you are finding red spots under the car, see our guide to car fluid and oil leaks for how to identify the source.

Can You Mix Transmission Fluid Types?

You should not mix different specifications on purpose. Two fluids that both meet the same specification, such as two brands of Dexron VI, can be mixed. Mixing specifications, or mixing ATF with CVT fluid, changes the friction characteristics and can cause shifting problems. The same caution applies to power steering systems: some cars use ATF in the power steering, while many others require a dedicated power steering fluid.

Type F vs Type A and Other Old Fluid Names

Type F, introduced by Ford, has no friction modifiers, which gives firmer, quicker clutch engagement; it is still specified for some classic Fords, older imports and some power steering systems. Type A was an early general-purpose ATF that has long been replaced by Dexron and Mercon specifications. Do not put Type F in a transmission that calls for a modern friction-modified fluid, or the reverse.

Why Transmission Fluids Keep Getting Thinner

Automakers have steadily moved to lower-viscosity fluids such as Dexron ULV, Mercon ULV and Toyota WS. Thinner fluid reduces internal friction, which improves fuel economy, and it flows quickly in cold weather so modern 8-, 9- and 10-speed transmissions can shift precisely. The trade-off is that these fluids are engineered for specific internal clearances and friction materials.

• Never put a thinner ULV fluid in a transmission designed for a thicker fluid, or the reverse.
• Do not assume a newer spec replaces an older one unless the automaker says it is backward compatible (Dexron VI for older GM units is a common example; Mercon LV for Mercon V units is not).
• Thin fluids are not a sign of lower quality; they are a design requirement.

How Much Transmission Fluid Does a Car Need, and What Does It Cost?

A transmission usually holds far more fluid than one service replaces, because a lot stays in the torque converter and cooler lines.

Because a single drain-and-fill replaces only part of the fluid, some shops recommend two or three drain-and-fills a few hundred miles apart to refresh very old fluid gradually. Your owner’s manual lists the exact capacity and check procedure.

How Often Should Transmission Fluid Be Changed?

Intervals vary more than for engine oil. Some manufacturers suggest changes every 30,000 to 60,000 miles under severe use, while others describe the fluid as long-life under normal driving. Towing, frequent short trips and hot climates all shorten the interval. Our car maintenance schedule by mileage shows where fluid services usually fall, and if you are wondering whether your car even has a clutch pedal to worry about, our explainer on whether automatic cars have a clutch covers how automatics use internal clutches.

Related guides: car noises explained, dashboard symbols and meanings and why your car is shaking.

Transmission Fluid Types FAQ