So what's the deal with all the DOTs? DOT or "US Department Of Transportation" is used to classify the various fluids in the market. DOT 3, 4 and 5.1 brake fluids are glycol based while DOT 5 is silicone based. The higher the DOT number the higher the boiling point of the brake fluid indicating the ability of the brake fluid to withstand higher temperatures. However please do not use silicone (Dot 5) based brake fluids unless mentioned ok to use in your car's user/owner manual as these can damage the ABS system and even the brake seals in your car. Interestingly enough the boiling point of the RBF600 exceeds the Motul 5.1 despite the lower DOT rating. Confusing huh? The wet boiling point of the RBF600 is listed as 216 degrees C/420 degrees F while the dry boiling point 180 degrees C/356 degrees F.
Motul sells the RBF600 in 500ml bottles so I promptly bought 3 bottles to be on the safe side even though most brake fluid drain/refill operations will use bout 2 bottles. Apart from brakes, brake fluid is also a very good hydraulic fluid and can be used for the clutch system which is where I'm intending to use my excess fluid. Beauty shot of the brake fluid below
The brake fluid is waiting to go in together with a whole host of other stuff when I can find some time.