Thread: Spark plugs
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Old 02-03-2009, 12:10 AM   #1 (permalink)
The Atomic Ass
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Priinocchio - '17 Toyota Prius Two Eco
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Spark plugs

What does it indicate, if when you pull a plug, the threads are oily, and some oily sludge exists slightly outside of the compression ring, in a situation where the plug boot fully seals around the plug hole? (The plug hole was clean otherwise, so this didn't seep in from outside).

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