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Sparkybuoy, Auto Mechanic
Category: Toyota
Satisfied Customers: 639
Experience:  15 years Toyota Tech
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Why is there oil in my spark plugs How do I fix it What ...

Customer Question

Why is there oil in my spark plugs? How do I fix it? What might happen if I leave oil in my spark plugs?
Submitted: 10 years ago.
Category: Toyota
Expert:  Sparkybuoy replied 10 years ago.

It's either because the spark plug well seals in the valve cover are leaking, the plug well tubes themselves are leaking where they screw into the head(s) or both. If you pull out a plug wire and and it's wet with oil, you have to look inside the well with a flashlight and see if the oil trail is coming all the way from the top of the well (valve cover seal).

If you leave that going on, it will eventually contaminate the wires so bad they'll misfire.

What year, model and engine size is it?