Oil in Spark Plug Tube

[turkeyboy]

My 2020 Rubicon has 155,000 miles. Thought it was waaaaay past time to replace spark plugs. After living the nightmare of removing the intake manifold, I pulled the first plug. There was some oil on the plug. Does this indicate that the valve cover gasket is leaking? Or something more serious?

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[Hootbro]

Sound like the spark plug tube gaskets are leaking. Looks like they are sold as a set with the valve cover gasket.

https://www.rockauto.com/en/catalog...6l+v6,3444100,engine,valve+cover+gasket,10710

 

[NC_Overland]

Very common on a lot of OHC engines. Like previously stated, replace the tubes.

 

[NC_Overland]

Btw. 155k? You do a lot of driving!

 

[turkeyboy]

Thank you! I’ll try that. And yes, I drive a lot!

 

[csuengr]

Just under 17k miles on my 2024 and one of the tube seals is starting to leak.

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