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Reply to "Oil Switch"

This is true. For most newer engines (gas), after the initial break-in oil (3,000 miles or less) has been run, the engine should be go for conversion to synthetic. For those that come factory filled with synthetic, those engines have already been broken in on a petroleum based lube. Rebuilt engines may take up to 5,000 miles of break-in depending on how tight the tolerances were when rebuilt. Diesel engines shouldn't be converted until after they have a bare minimum of 10,000 miles IMHO. Diesels have much harder cylinders and thus take much longer to break in. Once broken in, the life of an engine can most definitely be extended simply by using synthetic oil and I'm talking full synthetic or PAO based oil.

"If a petroleum oil is required for break-in, it must be pretty abrasive. Why then wouldn't it continue to wear after the break-in ?"

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