E70, E71, F25: Oil Leak from Transfer Case - from service bulletin SI B24 01 13 (3/2013)

Applies to the following models:

- E70

- E71

- F25

Situation: 

Oil is leaking from the transmission area, or oil seepage is noticed from the transmission/transfer case area during a service.

Cause: 

The leak can be misdiagnosed as a transmission fluid leak from either the mechatronics sleeve or transmission oil pan. The leak is actually coming from the transfer case (input or output shaft seal).

Procedure: 

Before attempting to perform any repairs, check the fluid level in both the transmission and transfer case.

If the level is low in the transfer case, repair as necessary.