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I run 5,000 miles between changes, It is close too 6 month's some more some less. So I stick too just milage. That said I womp on my bjke and Ram all the time, It does the motor no good I'm sure but If I think it's abuse then I change out early. mobil 1 gets the nod, amsoil is quality hands down. but m1 is for me, Colored syrup is for kids.imo.