Why was the spark plug bore full of engine oil?

2010 NISSAN X-TRAIL
100,000 MILES • 2.5L • 4 CYL • 4WD • AUTOMATIC
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PORTGAS D ACE
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  • 28 POSTS
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?
Feb 16, 2022 at 3:03 AM
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SQM
  • ✓Experienced 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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Feb 16, 2022 at 5:39 AM
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