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Q: one of my spark plugs was covered driping with oil as if i submereged it in oil. on 2005 Toyota Tundra

it seems to run fine. there is no smoking from exhaust ,performance is the same.
is there a seal somewhete
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most will find a spark plug tube seal failed, this tube seal is used when a spark plug goes thru the engine valve cover into the cylinder head, so the leak is an actually external leak onto the spark plug not internal in the combustion chamber, this explains why the engine runs fine.
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