Mag 1, 12 OZ, DOT 4 Premium Brake Fluid, Extra Margin Of Safety To Meet Or Exceed Federal Motor Vehicle Safety Standard FMVSS NO, 116 & Society Of Automotive Engineers SAE J1703 Specifications, Compatible With & Can Be Used As A Replacement For DOT 3, DOT 4, Designed For Severe Duty Applications Where Extreme Heat Is Encountered Such As Racing Or Towing Applications.