Spark plug has oil on threads. : r/Cartalk
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oil on spark plugs, but only on the Threads? - CorvetteForum - Chevrolet Corvette Forum Discussion
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Is it okay if oil goes into the spark plug well? - Quora
What Causes Oil on Spark Plug Threads and in Spark Plug Wells?
6 Reasons There's Oil on Your Spark Plug Threads (or in the Wells)
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Do these spark plugs look normal? : r/MechanicAdvice
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vw - Oil leaking from spark plug socket - Motor Vehicle Maintenance & Repair Stack Exchange
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Oil on Spark plug thread. - ClubLexus - Lexus Forum Discussion
Why do I have small amount of oil on my plugs but they are not fouling out and no smoke? - Quora
