oil on spark plugs? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Engine Tunes/Mods

Engine Tunes/Mods Performance Engine Tuning/Engine Modifications

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  #1  
Old 07-07-2010, 11:11 PM
AIR FLIGHT4536 AIR FLIGHT4536 is offline
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2002 Chevy TrailBlazer LS
Summit White 4.2L I6 2WD
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oil on spark plugs?

I just changed my spark plugs on my 02 trailblazer ls for the first time at 147,000 miles. As I pulled out my spark plugs I noticed that 2 of them had the threads covered in oil. Is this normal?
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  #2  
Old 07-08-2010, 12:54 AM
WOOLUF1952 WOOLUF1952 is offline
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2003 GMC Envoy SLT
Magnetic Red Metallic 4.2L I6 4X4
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Yes. As long as the oil is mostly on the threads. The valve cover gaskets sometimes leak into the spark plug well.
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