To maintain the efficiency of your transmission and allow it to shift from gear to gear smoothly, transmission fluid is critical.
Transmission fluid is a kind of gear oil that lubricates the moving elements, maintains gaskets and other components in good operating order, and helps to keep the transmission cool.
Most transmission fluids should be replaced every three years or 45,000 miles. But check with your trusted and certified technician to determine transmission fluid change intervals for your particular vehicle.