The problem is called blow by. This is normal for a worn engine with lots of miles. If your pcv system is in good working order. Then you are getting blow by "excessive crank case pressure blowing by the piston rings. The only repair would a engine overhaul. Another way to check for excessive blow by is to remove the oil fill cap when engine is running, if you get excessive pressure blowing out the top of valve cover when cap is removed, a good thing to check when purchasing a older used vehicle.
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