Oil leaking under transmission splash shield

Calebv · 08-06-2021, 07:28 PM

Got an oil leak near the transmission but I haven’t taken off the shield yet to check where it’s coming from. Left the car for a month sitting while I was on vacation, was left with a big oil stain on the cardboard under the car. This piece behind the shield also seems to be oily. Thoughts ?Attachment 2666559

e90yyc · 08-06-2021, 07:41 PM

First thought is that it makes a lot more sense to actually take the splash shield off than it does to shotgun guesses

Seriously though—it could be a number of sources. Is it motor oil for sure?

mweisdorfer · 08-07-2021, 07:24 AM

Does it smell like transmission fluid or oil?

mainbearing · 08-07-2021, 11:23 AM

Mechatronic sleeve o-rings leak?

Drop the belly pan to find out.

Fritzer · 08-07-2021, 12:05 PM

If it is engine oil that far back, could be rear main seal. If it is that substantial of a leak from sitting, you should be able to clearly see the source once shields are removed.

08-06-2021, 07:28 PM	#1
Calebv Registered 0 Rep 1 Posts Drives: E90 335xi Join Date: Aug 2021 Location: Phoenix, AZ iTrader: (0)	Oil leaking under transmission splash shield Got an oil leak near the transmission but I haven’t taken off the shield yet to check where it’s coming from. Left the car for a month sitting while I was on vacation, was left with a big oil stain on the cardboard under the car. This piece behind the shield also seems to be oily. Thoughts ?Attachment 2666559 Attached Images
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08-06-2021, 07:41 PM	#2
e90yyc Art Collector 2427 Rep 3,450 Posts Drives: 2007 328xi (GM-delete 6MT) Join Date: Feb 2018 Location: Canada iTrader: (0)	First thought is that it makes a lot more sense to actually take the splash shield off than it does to shotgun guesses Seriously though—it could be a number of sources. Is it motor oil for sure? __________________ When I'm dead, just throw me in the trash.
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08-07-2021, 07:24 AM	#3
mweisdorfer Major General 1905 Rep 6,968 Posts Drives: 2007 Black/Black 335i e90 Join Date: Apr 2011 Location: Holly, MI iTrader: (0) Garage List 2007 BMW E90 335i [0.00] 2008 bmw x5 [0.00]	Does it smell like transmission fluid or oil?
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08-07-2021, 11:23 AM	#4
mainbearing Lieutenant Colonel 1085 Rep 1,677 Posts Drives: BMW 328i Join Date: Apr 2019 Location: LA iTrader: (0)	Mechatronic sleeve o-rings leak? Drop the belly pan to find out.
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08-07-2021, 12:05 PM	#5
Fritzer No one sleep in Tokyo 945 Rep 1,507 Posts Drives: 2011 E90 328i//1995 E34 530i Join Date: Oct 2018 Location: San Diego, California -> Austin, Texas iTrader: (3)	If it is engine oil that far back, could be rear main seal. If it is that substantial of a leak from sitting, you should be able to clearly see the source once shields are removed. __________________ 2011 E90 328i, 1995 E34 530i, 1992 E32 740i, 1991 E34 525i
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