Phillips 66® PowerDrive® Synthetic Arctic TO-4 is a full-synthetic, multi-functional lubricant specifically engineered for heavy-duty off-road equipment operating in extreme sub-zero environments. Designed to meet the stringent frictional requirements of Caterpillar TO-4 and Allison C-4, this fluid provides immediate hydraulic response and gear protection where conventional fluids would turn to a near-solid state. Its 100% synthetic base stock offers an exceptionally high viscosity index, ensuring that the fluid remains thin enough for rapid circulation at -50°C while maintaining the critical film strength required to protect high-torque final drives and transmissions when equipment reaches operating temperature.