Reasons for excessive exhaust smoke?

AJ/FormS said

Make sure your PCV hose is not collapsing under vacuum, or freezing up. And that the breather is not iced up

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I read here or in the factory service manual that a way to check the PCV is to remove the oil filler cap with the engine running and hold a piece of paper or something like a 3x5 card over (close to) the valve cover oil filler opening. If the paper is pulled the filler opening, the PCV works.