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Craftsman 6.5hp lawn mowers can use two kinds of oil--"HD 30" oil, which is a single-weight SAE 30, or the same oil you put in your car. (If you have a Honda lawn mower, you have to run multigrade oil in it.) I always have a case of 5W30 Castrol sitting there, and that's what I use because it's right there already. I also have some 15W40 Rotella on hand, but I wouldn't put that in a lawn mower--it's too thick. (Works good in a Cummins ISX, though.)

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16y ago

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