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What is transmission fluid?

What is transmission fluid?
Transmission refers simply to the gearbox that uses gear and gear trains to provide speed and torque conversions from a rotating power source (engine) to another device (wheels). Transmission fluid is used to lubricate the components of a car’s transmission for optimum performance.

Types of transmission fluids
A variety of fluids are used for different transmissions. Your car’s transmission can either be automatic or manual. Automatic transmissions use something called — as you might have guessed — automatic transmission fluid (ATF). The right use of automatic transmission fluid is highly dependent on the technology of your car’s transmission: traditional, CVT, DCT/DSG, etc.). These are quite specific in application.

Manual transmissions (most of them) use a variety of oils that have the API specification GL-4. To ensure that you are using the correct fluid for your car’s transmission, please consult your owner's manual.

Why you need transmission fluid?
It's very important that the fluid in your transmission is at the proper level, or your transmission will experience significant wear. The synchro rings and sliders depend on a slick surface to match speeds when shifting. If your transmission is low on oil, the wear on these components will accelerate significantly and shifting the car will be more difficult. If your car is having problems shifting, check the level of the transmission oil.

While the primary function of transmission fluids is to lubricate the various parts of the transmission, it can serve other functions as well:

  • Clean and protect metal surfaces from wear
  • Condition gaskets
  • Enhance cooling function and reduce high operating temperatures
  • Increase rotational speed and temperature range

Changing your transmission fluid
Transmissions are designed to operate at high temperatures, but consistent overheating can break down the fluid. Therefore, contrary to popular belief, transmission fluids are not “filled-for-life” and need to be replaced. To find out about the recommended change intervals, as always, consult your owner’s manual or check our oil advisor tool.

Rymax transmission fluid
Rymax has a complete range of fluids for automatic and manual gearboxes suitable for automotive and off-road applications. All our products provide excellent protection against wear and promote longer machine life and smoother gear changes.

To learn more about our products, click here

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