Why was the spark plug bore full of engine oil?

PORTGAS D ACE

MEMBER
2010 NISSAN X-TRAIL
2.5L
4 CYL
4WD
AUTOMATIC
100,000 MILES

Hello, today I checked my engine, and the coil or spark plug bore was full of oil but I couldn't remove the spark plug because I don't have tools for it. My question is, why was the spark plug bore full of engine oil? Where does it leak?

1 Reply

SQM

MECHANIC
6,383 POSTS

Hello,

It sounds like you have a leaking valve cover gasket. When the spark plug tube seals go bad, it will allow oil to leak out and get on the spark plug hole.

To fix this you will have to replace the gasket.

Here is a helpful guide on valve cover gasket replacement:

https://www.2carpros.com/articles/replace-valve-cover-gasket

I have attached diagrams below for your reference.

Please let me know if you have any questions.
Thank you.

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