2002 Trailblazer with oil in sparkplug opening......

[The Man]

What would cause the area between the spark plug and boot to literally be filled with oil? Like its full with oil, all 6 plugs.

Intake gasket is what I'm thinking? Any idea on how much to repair something like that? 155,000 miles on it too.

Thanks.

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[dave89iroc]

Valve cover gasket leaking, NOT the intake gasket

 

[The Man]

Really? Is this common? I've dealt with 2 other family members trailblazers, and those seemed to have oil in the last plug but this one has all 6 filled to the top.

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[dave89iroc]

Rare on trailblazers, but not uncommon on all engines with the spark plugs through the valve cover

 

[82bird]

x2, valve cover gasket