Transmission fluid lubricates the moving parts of the car engine, the gears, bearings and torque converters, which are transmitting power to the wheels. The transmission fluid keeps these parts operating smoothly and also keeps them cool by absorbing the heat produced. Fluid temperatures can rise to as high as 175 degrees Fahrenheit (79 degrees Celsius), but rise higher in cars with automatic transmission. When your car is running sluggish, losing power, or doesn't have the punch it normally does then it's time to change the transmission fluid. It should be changed at least twice a year, or more if your car is clocking longer mileage....the detail mileage for transmission fluid changes are mentioned in every car manual.
The newer low-viscosity transmission fluid are said to be "fill for life" fluids and don't require any change with normal driving conditions. Low viscosity transmission fluids reduce internal drag and shift effort when the engine is cold. They also reduce CO2 emissions.
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