Oil on spark plug threads is a symptom that rarely appears without warning. Valve Cover Gasket Failure A hardened or brittle valve cover gasket is the most frequent source of this problem.
Fix Oil Leaking Threads Spark Plug: Causes and Solutions
Confirm whether the leak is internal (rings) or external (gaskets). Consequences of Ignoring the Issue Operating an engine with oil on the spark plug threads is a risk to long-term reliability.
Common Visual Signs Thick, black oil coating on the plug's ceramic insulator and metal base. 3 Pressurize the cooling system or perform a leak-down test.
Fix Oil Leaking Threads Spark Plug
Oil dripping from the spark plug hole upon removal. Shiny, hardened oil deposits around the plug well's opening.
More About Oil on spark plug threads
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