Transmission stop leak products work for small or minor transmission leaks. If the transmission leaks a large amount of fluid, stop leak should not be used.
Transmission stop leak can be used for most makes and models of vehicle. Stop leak is used by replacing lost transmission fluid. When the fluid is low, the stop leak product can be added to bring the fluid level back to its desired level. Often, car owners will notice their transmission leaking underneath the car as it is brown or red in color. If stop leak does not work, the transmission should be checked by a mechanic.