Quote:
Originally Posted by vilant
Got a noob question. I have a 90', and when I took the air intake off, I noticed a little bit of oil in the plenum. Is that normal? I know the reason you add an oil catch can is to stop that. But, I don't see a "factory" oil catch can. Why didn't GM put one in. Did they design the engine knowing it was going to suck in some oil and it would just burn off?
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The oil has fuel in it, I believe one of the purposes of the PCV system is to evacuate any fuel blowby and keep it out of the oil. I suspect they can not catch it and be EPA compliant, so the fuely oil is burned through the engine.