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I was took out 2 spark plugs on one side of the engine and I noticed some engine oil in my spark plug wells. Any one know where this oil is coming from? And I also noticed some engine oil in my Throttle body. Any one know where its coming from? The valve covers don't seem to be leaking,

Silverado 1500
5.3L Vortec
 

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I'd guess plugged crankcase ventilation. Probably bad pcv valve? Excess pressure can blow out valve cover gaskets.
 
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