Rings do wear out, and will cause smoke in the cabin. The PCV system will work for minor cases of smoke, but the problem will soon overpower the PCV. Rings are supposed to have an end gap of about 10 mils. My first engine tear-down, I found that the lower rings had over 100 mils end gap - they were just going along for the ride! New rings (and a new transmission seal) brought the engine back like new.
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