Oil on valve covers

RustyRatRod said

Technically correct, but they ALL route the breather SOMEWHERE with a negative pressure, be it the air cleaner, air intake tube or wherever. That's a part of the system.

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I agree that all Positive Crankcase Ventilation systems have low pressure, vacuum into the crankcase, and high, atmospheric air letting air into the crankcase, from somewhere, on older engines , usually the breather on a valve cover. And I do have the utmost respect for RRR,s knowledge on engines. :burnout:MT