You really need to look at the specs on the fluid, before buying, as DOT rating are simply minimum standards that must be met. Looking at the two fluids mentioned, the Valvoline 3/4 has a 480 deg. dry boiling point with a 311 deg. minimum wet (this is the important # to compare) boiling point. The Motul RBF600 is listed as an DOT4 fluid, but has much better specs @ 594 dry and 383 min. wet boiling points. I've used the RBF600 for a couple yrs. now in my hydraulic clutch, and it's a very good fluid with about the best specs out there. The DOT5 mentioned is NOT recommended for ABS braking systems - it's silicon based and not compatible with normal fluids. There is a DOT5.1 which is glycol based and OK to use.