Bimmerfest - BMW Forums - View Single Post - Air Quality - Smells like engine oil breather is connected to Interior Air Filter?!
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Old 10-07-2012, 11:56 PM
Leekay07 Leekay07 is online now
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Location: Stillwater NY
Join Date: Jan 2012
Posts: 646
Mein Auto: MY12 550I,MY09 X5.
are you running aftermarket air cooler?

Normaly this is the result of using a aftermarket air cooler and then leaving the PCV valve open instead of putting it into a catch can.

Also check your Oil filter housing see if you have any seepage
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