Originally Posted by bmw6953
Your mechatronics sealing sleeve/transmission pan gasket are leaking. This a very common issue. E90 owners will see this alot more as cars start to age espcially in the 06-07 range.
Literally just had mine replaced this past week. The dealer had to drop the oil pan on the trans to get it though? I didn't want to mess anything up so I let them do it.