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#10 |
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Senior Member
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 4,608
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I don't see a problem with using synthetic in a flathead. Probably not on an old well worn engine. But we build these engines today with pretty close tolerances, just like any modern engine. And I don't like using diesel oil in a flathead either. It is not formulated like a gas engine oil.
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