Recently changed out the unknown fluid with this stuff. Can't say that it is a huge difference, but afterward I did notice a slightly better braking feel. Of course, it is also Repsol... who better to use on my Honda 954??
Moto DOT4 is a special polyethylene glycol based product developed and designed by Repsol for motorcycle hydraulic systems working in severe conditions where DOT 4 or DOT 3 fluid is recommended. It ensures maximum efficiency and optimum operating stability of the brake system, and is recommended for high-performance vehicles and in all types of brake systems that require a product with this level of quality.