Transmission fluid is a slippery liquid that acts as a lubricant for all of the moving parts inside your transmission. In an automatic transmission, this fluid also serves as a coolant and a viscous fluid that transmits power from the engine to the transmission.
A variety of fluids are used for different transmissions. Automatic transmissions use automatic transmission fluid. Manual transmissions use a variety of oils: regular motor oil, heavyweight hybrid gear oil or even automatic transmission fluid in some cases. Your owner’s manual will tell you what your transmission calls for.
By keeping up with the your vehicle’s recommended transmission fluid change schedule, you can keep your transmission in good working order and decrease the likelihood of costly transmission repairs down the road. In many cases, a transmission fluid exchange is due every 30,000 miles or 2 years.