Phillips 66® Triton® Heavy Duty ATF is a premium, full-synthetic automatic transmission fluid specifically engineered for the punishing duty cycles of transit buses, refuse trucks, and emergency vehicles. Built to survive where conventional fluids fail, this high-performance lubricant provides exceptional thermal stability and resistance to oxidation, allowing for significantly extended drain intervals up to four times longer than standard mineral-based ATFs. Its 100% synthetic base stock ensures superior performance in extreme temperature ranges—maintaining a robust lubricating film in the searing heat of summer and providing instant hydraulic response in sub-zero winter mornings. By utilizing advanced friction modifiers, Triton Heavy Duty ensures consistent, smooth shift quality throughout the entire service life of the fluid.