Auto Repair Encyclopedia
Transmission Fluid and Filter Replacement
Automatic transmission fluid lubricates and removes heat from internal components in the transmission. The transmission filter removes debris from the transmission fluid.
To replace the automatic transmission filter, the transmission pan is removed, allowing the fluid to drain from the transmission. Then the transmission filter is removed and replaced. Next, the oil pan is cleaned and inspected for debris and then reinstalled with a new pan gasket. Finally, the transmission is filled with fresh fluid, and the engine is started.
With the engine running and the transmission in "Park," the transmission fluid level is checked on the dipstick. Then the vehicle is driven and the oil level rechecked; more fluid is added is needed,.
The transmission fluid should be replaced at the same time as the filter to avoid contaminating the new filter.
About this Repair: Automatic Transmission Fluid/Filter Change
Recommendations
Your repair shop may recommend a transmission fluid flush, which will require up to 16 quarts of transmission fluid. This will increase the parts and labor price when compared to a normal drain and fill of the transmission.
Why this happens
We recommend changing the transmission fluid and filter every 30,000 miles under normal conditions. If you operate your vehicle under "Severe Conditions", e.g extreme weather, towing or a lot of stop and go traffic, the transmission should be serviced every 20,000 - 30,000 miles.
