MOTUL RBF 660 is full 100% synthetic brake fluid specifically designed to resist the high temperatures of racing brake pads and clutch system. MOTUL RBF 660 far exceeds the standards of DOT3, DOT4, and DOT 5.1 with extremely high dry and wet boiling points to prevent vapor lock and brake fade.

EXTREME THERMAL RESISTANCE AND STABILITY: The extremely high dry boiling point of RBF 660 (325°c / 617°F) enables effective braking under even the most extreme conditions of racing and competition.

SPECS -

- Dry boiling point (325 degrees C, 617 degrees F)

- Wet boiling point (204 degrees C, 400 degrees F)

In general, as the saying goes, you get what you pay for.

The higher the price for the brake fluid, the more abuse it will be able to take, and the less often you will need to do brake bleeds when at the track or between track days.  The Motul RBF 660 is the highest boiling point in the Motul line.