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DOT 3 and DOT 4 are functionally very similar. 4 has a higher boiling point, but motorcycle brake systems don't generate the kind of pressure and temperatures that need it on the street, in general, although it certainly won't hurt your system to put it in. DOT 5 is very different--it's silicone based, doesn't absorb water, isn't corrosive, is bad for some seals, is hard to bleed, and is not miscible with 3 or 4. Stay away from it--it needs a system designed for it. And it comes as stock item in Harley's, so it must be terrible. :-> DOT 5.1 is compatible with DOT 3 & DOT 4 (If I ever get hold of the bonehead who named DOT 5.1...) Here's more detail than you really want: DOT3 is an aliphatic polyether. DOT4 is borate ester based. DOT5 is polydimethylsiloxane (silicone based). DOT5.1 is borate ester based, thus its compatibility with DOT3 and