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Why did I found oil on 2 of my spark plugs. And my oil dipstick reads low oil on 2004 Chevrolet Trailblazer

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Every time I changed my oil I'll go back to check the level 2 or 3 weeks later and it reads 2 quarts low. No leaks anywhere. Not burning oil either. But I changed my plugs and 2 of the 6 were covered in oil. It was dripping off them. Is this bad valve cover gaskets? O rings?
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which end of the spark plug was covered in oil? What shape was the electrode in? "no leaks anywhere" would mean that the oil on the plugs came from the inside of the cylinder? Do a compression test or cyl. leak-down test. Monitor LIVE data and see what your fuel trim is.
It was on the electrode side of the plugs. Yes the oil came from inside the cylinder. I'm going to do the compression test Monday, I'm kinda hoping it's just the valve cover gasket. But I'm thinking it's bad rings
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