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FWIW..... several manufacturers moved from 5W-30 to 5W-20 as they tried to find ways to meet the lovel EPA fuel mileage requirements. They have used evcery combination possible to help reduce fuel consumption. The engine works every so slightly easier to pump the oil through the engine. Then couple oil viscosity with weight reductions, reprogrammed ECU's to change timing and fuel delivery and it all becomes part of the equation to meet fuel economy standards.
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