Sorry but I use a 5/30 synthetic, Fact: it takes less horsepower to move light oil at temp. That means better milage,more power, and less stress on internal parts.(oil dirve, cam, lifter on cam), and like others hear noted. Most wear happen in the first five min. after start up. So if you starting 5+times a day or more. See were this is going.
Depending on the year, some oils have additives that are not compatable with the seals. Some older models don't do well with newer oil blends.
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