Red Line 30204 High Temperature Automatic Transmission Fluid (ATF) - 1 Quart Bottle For heavily-loaded vehicles, allowing operation at up to 70°F higher while maintaining thicker viscosity than traditional ATFs Use where Dexron III, Dexron II, Mercon or GL-4 gear oil are recommended Dramatically less evaporation, less varnish of valves and clutches in extreme conditions Reduced oxidation and lower volatility at high temperature Allows high-temp operation without varnishing valves and clutches