BOSCH ESI6-32N Brake Fluid (Direct Replacement for DOT 3, DOT 4, and DOT 5.1) - 1 QuartHigh compatibility. Use with or direct replacement for DOT 3, DOT 4, and DOT 5. 1 Extended Service Interval (ESI): Lasts 100 percent longer than DOT 3, 50 percent longer than DOT 4, and 10 percent longer than DOT 5. 1 Exceeds all DOT 3, DOT 4, and DOT 5. 1 standards Wet boiling point ~ 365 DegreeF Viscosity at 40 DegreeC ~ 685mm2 s Standard brake fluid has a recommended change interval of 2 years. The recommended change interval for Bosch ESI6 is 3