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That is apparently why there have been problems with late model Toyota engines sludging up. It has been suggested that Toyota reduced the size of the PCV system in order to improve the environmental scores. Now the engines don't rid themselves of the bad stuff and they sludge up if you don't keep the oil real clean. May be time to put a new PCV valve in my wife's Avalon.
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1968 Chevy - 292 with a powerglide
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