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slob · 12-03-2020, 05:30 PM

DOT 3
DOT 4
DOT 5.1 (note the ‘point one’)
are all ok, they’re all Glycol based (and mixable). The main difference is the boiling point.

DOT 5 is Silicon based and can’t be mixed with Glycol based types, it will also cause problems with seals in systems not designed for it. AFAIK Harley-Davidson are the only bike manufacturer that specify DOT 5

12-03-2020, 05:30 PM	#3
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,712	DOT 3 DOT 4 DOT 5.1 (note the ‘point one’) are all ok, they’re all Glycol based (and mixable). The main difference is the boiling point. DOT 5 is Silicon based and can’t be mixed with Glycol based types, it will also cause problems with seals in systems not designed for it. AFAIK Harley-Davidson are the only bike manufacturer that specify DOT 5 Last edited by slob; 12-03-2020 at 05:33 PM..