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To continue on feuer's comment, it could be multiple things depending on how old the car is and what gaskets have been replaced. Valve cover gasket, oil filter housing gasket, and oil pan gasket are 3 items that will need to be changed before 100k miles.
Regarding, the M3 control arms. I can't answer that. I'm not sure how different they are to OEM's. I just know they are a little longer, hence the added negative camber they give.
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N52 : 6MT : ZSP : ZPP : BC Racing Coilovers : BMW PE
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