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Discussion Starter #1
I mean head covers. Could they cause a lean code?

I noticed some oil coming out the seam where the covers mate to the head. Engine runs great and does not seem to lose oil when I check the dipstick. The bolts were all loose.

Should I be worrying about a larger problem?
 

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Discussion Starter #2
Maybe it is not oil coming out but exhaust residue?

My thought about the lean code was: If the engine was under vacuum when the intake valve opened it could suck in unmetered air through the head cover leak...
 
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