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Old 08-25-2011, 02:13 PM   #8
DIY
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Join Date: Aug 2010
Location: Etobicoke
Posts: 540
I had somebody tell me that the mahl filter (the stock one) actually helps regulate the oil pressure, I've always used fram or k&N without prob but maybe try that,

just google stomp test or E30 codes(I think you have to have a 55pin ecu but its worth a shot) I don't know much about the M42
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