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    How much does oil viscosity really change mpg?

    I have a 2022 that is marked for 0-20 oil. 0-20 may be the best choice to squeeze out an extra 200ft from a gallon of gas, but is it the best choice for longevity of my engine? It certainly raises suspicion when the factory service manual specs only 0-20 if you live in the US, but when in...
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