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So i'm looking for an opinion on brake fluids, I just got some steel lines and I see there many different DOT 4 fluids out there and DOT 5.1. I've heard that DOT 5.1 is the best but breaks down fast or something like that? I have no idea.
I'm assuming DOT 4 will be fine for street riding and the occasional track day so I started looking and there is a decent differece in the fluid prices...
Repsol - 4.95 a bottle
Motorex - 8.75 a bottle
and
Motul RBF - 19.50 a bottle
From my understanding the Repsol has a boiling point of 311 F and the Motul RBF (which is designed for racing) has a boiling point of 594 F.
Is it worth it to spend double, or ever 3 times the Repsol for these other brands?