Yep, the oil filter housing gasket. Mine is doing the exact same thing. I will change the gasket at next oil change.

I don't trust anyone either. Do 95% of the work myself because 1)I enjoy it and 2)don't trust anyone.

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'03 Black BMW E53 3.0i 110,000+ miles
'03 Black Mercedes-Benz W211 125,000+ miles
'13 White Mercedes-Benz W2o4 New