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Synthetic Engine Oils Versus Conventional Engine Oils..

January 26th, 2009
In the old days, people living in cold climates put in a thinner oil for the winter with a “W” or cold temperature-viscosity rating. Although they poured better at low temperatures, straight-viscosity “W” oils, in turn, didn’t do a good job of protecting engines once they reached normal operating temperatures, so they weren’t recommended [...]