How to check and add fluid to the GM 5L40E automatic transmission, found in many GM and BMW vehicles.

CLARIFICATION!!! It was a really long day. Long enough that I grabbed a bottle of Mercon from my Powerstroke and not the bottle of Dexron VI right next to it. I managed to miss the giant "For Ford Vehicles" on the bottle even. This lead to draining about 7 quarts of brand new Dexron out of the car and the necessity for a trans flush in the immediate future.

DO. NOT. USE. MERCON!!!!! Dexron VI only! Sorry guys,

Tools required: Torx T40 socket, extension, socket wrench.

Estimated time to complete: 1 Hr