Thin oil/Piston ring seal

[Steve S]

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Low tension rings has a lot to do with it IMO. I also think people should be breaking in their cars with more WOT, although many say most engines are already broken in by the time you drive it off the lot.

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No they are not . Look at the used oil analysis wear # as they drop on new engine used oil analysis and also the gas mileage increases as the engines get to the 5,000 mile or so mark.