Automatic Transmission Fluid
The most proven and extensive ATF capability worldwide
Automatic transmission fluids are used in the transmissions of passenger cars, commercial vehicles, off-road trucks, mobile equipment and in non-transmission applications, such as power steering, small hydraulic pumps and farm applications.
Changing ATF needs
For passenger cars and commercial vehicles, OEMs are demanding longer drain intervals and fill- for-life capability. Automatic transmissions are changing in design from 5 to 6 speed and now even 7 speed capability, improving drivability and performance. To improve fuel economy, transmission components are lighter, despite increased engine horsepower. And new fuel-efficient transmissions exhibit higher torque and higher operating temperatures. All these factors are stressing the ATF severely. Problems such as transmission shudder, poor shift feel and accelerated wear are becoming more common as drain intervals are increased. ATFs must provide fill-for-life capability, improved fuel economy, antishudder friction durability, shear stability, low-temperature fluidity and improved oxidation stability.
New fuel-efficient transmission designs, such as the Continuous Variable Transmission (CVT) and the Dual Clutch Transmission (DCT), are entering the market. These new transmission designs are calling for different fluid technologies to meet increasing performance requirements
Meeting the needs
ATF is the most complex of all lubricating fluids. Not only does it have to reduce friction to prevent wear like all lubricants, but it also has to allow a certain level of friction so clutch materials can engage. Since most OEMs use proprietary frictional materials, virtually every ATF is OEM-specific. In some cases, they're transmission-specific. In addition, ATFs must be compatible with all transmission components, operate at both low and high temperature extremes, and maintain constant performance for extended periods.
To accomplish these complex tasks, ATF typically contains the following components:
||Sludge & varnish control
||Planetary gear, bushing, thrust washer protection
||Modify clutch plate and band friction
||Prevent corrosion and rust
|Seal swell agent
||Prevent loss of fluid via seals
||Reduce rate of change of viscosity
|Pour Point Depressant
||Improve low temperature fluidity
The technology innovator
Lubrizol has played a leading role in developing fluid technology for ATF applications. ATF research has been the key to maintaining our dominant position in the global market. Inventiveness is documented in a number of industry firsts:
- Type A automatic transmission fluid additives
- Type A - Suffix A automatic transmission fluid additives
- DEXRON automatic transmission fluid additives
- Multifunctional power transmission fluid additives for automatic transmission fluid and non-ATF applications
- Ford MERCON additives
- DEXRON III automatic transmission fluid additive
- Powershift transmission and drivetrain oil additives
- Continuously variable transmission oil additives
We are the only additive company that covers all on- and off-road applications worldwide. With our unparalleled breadth and depth of people, knowledge and technical facilities, we continue to introduce innovative ATF technologies that further reduce shudder, improve shift feel and increase fluid and transmission durability despite severe operating conditions. We work closely with OEMs to solve their fluid problems as they advance transmission technology.