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I happen to run the Motor City full flow system on my engine which I built in 1993. I do not have a PCV system and the inside of my engine looks just like the day I built it. I do run 180 deg thermostats. As I have said, a PCV system is a good idea but not essential to a clean engine. Sludge build up in the old engines probably had as much to do with the oil technology at that time than anything else.