Motul RBF 660 Factory Line Brake fluid 
This high-performance brake fluid is fully compatible with your BMW and is designed to deliver reliable braking under extreme conditions—whether you’re on track days, racing, spirited street driving, or pushing your car to its limits.
100% Synthetic Racing Brake Fluid – DOT 4
Very high boiling point: 325°C / 617°F For hydraulic actuated brake and clutch systems
DOT 5.1 non silicone base (260°C mini / 500°F mini) and DOT 4 (230°C mini / 446°F mini), and therefore enables effective braking even in extreme conditions.
Very high wet boiling point (205°C / 401°F) is superior than the requirements of the standards DOT 5.1 non-silicone base (180°C mini / 356°F mini) and DOT 4 (155°C mini / 311°F mini), and therefore enables to keep efficient braking in wet conditions.
Specially designed to withstand the extreme temperature generated by racing carbon and ceramic brakes while allowing minimized air entrance for brake cooling.

Also suitable for conventional brakes with steel discs and for conventional hydraulic clutch actuators.
Allows better aerodynamic performance by reducing the need for brake cooling air scoops on vehicles.
 
Recommendations:
Drain interval: always according to manufacturers’ recommendations and to be tuned to your own use. Avoid mixing with lower performance polyglycol-based brake fluids. Do not mix with silicone (DOT 5 silicone base) or mineral base fluids (LHM). Store brake fluid in its original container, tightly closed to prevent moisture absorption. Aggressive chemical product if in contact with hands, paint or varnish. If skin contact, rinse thoroughly with water.
 
 
Disclaimer:
Product image is for illustrative purposes only. Actual contents and appearance may vary depending on vehicle specification and manufacturer supply.