Transportation Science

When do you need to change your car's transmission fluid?
Answered by Discovery Channel
  • Discovery Channel

    Discovery Channel

  1. Transmission fluid keeps the car's gears and torque converters lubricated. In most cars today, transmission fluid is released automatically; pressure changes in the automatic transmission fluid (ATF) cause the gears to change. The average transmission fluid temperature is around 175 degrees Fahrenheit (80 degrees Celsius). However, stop-and-go driving, traveling long distances or carrying a heavy load generates above-average transmission fluid temperatures. These higher temperatures cause the ATF to break down, affecting the smoothness of shifting. It is recommended you change the transmission fluid every 20,000 miles (32,200 kilometers).

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