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It is very common as the gasket may leak a bit. This is not serious and actualluy provides some lubrication to prevent the plugs from seizing. The all aluminum head in this engine does not with stand over tightening so please keep this in mind when replacing the plugs. Do not adjust the new iridium tip plugs as scratches to the surface may decrease their 100,000 mile life expectancey. www.trailvoy.com Enthusiasts helping enthusiasts!

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Q: Why is there oil in your 2003 Chevy Trailblazer sparkplugs?
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