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manual says if harley oil 20-50 not available to use oil suitable for diesel trux...there's some kinda additive in it i guess...anyway in decending order of best choices 20-50,15-40wt. dont use rotella 15-40 as they quit putting the additive in it. hd oil is probabl over priced and not necceserry

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15y ago
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Q: What weight oil do you use in a 2004 harley Davidson?
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