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1998 Sportster oil type & capacity

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3 hours ago, SkiPablo said:

any 15w40 diesel oil is what you want.  Add 5 quarts and check it - it might take 5.5 depending on how much you got to drain out.

Well, this has been debated here before at length.

I'm convinced that you only want a diesel oil if it has an "S" (spark) rating as well as a "C" (compression) rating due to the additives.  If it isn't "C" and "S" rated, I'm going to pass and find one that is.

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