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oil viscosity
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  1. General Technical Chat
    I have read several forum posts on this subject but none of them address an engine's mileage. There are discussions about 5W20 over 5W30 and that either is ok or not ok, etc. My 2010 Focus SEL engine has 110,000 miles on it and I have always used non synthetic 5W20 which it came with. It is...
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