TumblrDucks
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I was doing my annual spark plug change and notice one of my four plugs had oil on threads, a first time for me. It is the plug closest to driver seat. Engine runs normal with no obvious oil consumption and coolant is clear. Coils are all dry. What could cause it & what does it imply regarding my engine?
This set of plug has mileage of 15k / one year on my car.