N51 Pre Cat Lambda Sensor Oil Leak

jacraest · 05-17-2021, 08:45 PM

Never seen this before, only on 335s when turbo seals start going. Anyone got any ideas? I’m thinking oil burn (has to be), but oil changes are maintained well and no blue smoke/ measurable oil consumption.

jacraest · 05-20-2021, 11:50 PM

UPDATE: took off engine cover, peeped around and oil leak was coming thru valve cover after a few acceleration tests.

05-17-2021, 08:45 PM	#1
jacraest New Member 12 Rep 19 Posts Drives: 2009 328i LCi N51 Join Date: Apr 2021 Location: San Diego, CA iTrader: (0)	N51 Pre Cat Lambda Sensor Oil Leak Never seen this before, only on 335s when turbo seals start going. Anyone got any ideas? I’m thinking oil burn (has to be), but oil changes are maintained well and no blue smoke/ measurable oil consumption. Attached Images
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05-20-2021, 11:50 PM	#2
jacraest New Member 12 Rep 19 Posts Drives: 2009 328i LCi N51 Join Date: Apr 2021 Location: San Diego, CA iTrader: (0)	UPDATE: took off engine cover, peeped around and oil leak was coming thru valve cover after a few acceleration tests.
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