8HP Transmission: Fluid Loss From Cooler Line Connections - from service bulletin SI B24 02 15 (6/2015)
WARNING: This page does not describe the selected car, but rather 158 other vehicles, including the 2014 BMW i8, 2014 BMW i3, 2014 BMW X6 M, 2014 BMW X6, and 2014 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
Applies to the following models with N20, N26, or N55 engine and 8HP transmission:
- E84 (X1)
- E89 (Z4)
- F22 (2 Series Coupe)
- F23 (2 Series Convertible)
- F30 (3 Series Sedan)
- F31 (3 Series Sports Wagon)
- F32 (4 Series Coupe)
- F33 (4 Series Convertible)
- F34 (3 Series Gran Turismo)
- F36 (4 Series Gran Coupe)
Situation:
There is a transmission fluid leak in the area around the oil cooler lines (on the transmission side).
Cause:
Damaged o-rings due to unfavorable cooling line connection tolerances.
Procedure:
Verify that the transmission fluid leak originates from the cooling lines area.
If so, replace the o-rings and the cooling lines.
Only replacing the o-rings may cause a repeat failure.