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SOUNDS LIKE A SLIGHT LEAK IN THE OIL RINGS... you may just have to replace the PCV valve. it maybe plugged .. you may have some bad rings that are allowing blow-by more than normal, and the excessive blow-by is clogging up your pcv valve

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Q: The engine in your 1986 Chevy S10 has plenty of power but there is oil blowing onto the top of the engine?
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