PURUS® Arctic Synthetic TO-4 Fluid is a premium-quality, synthetic, multigrade drivetrain lubricant formulated for off-highway and heavy-duty commercial equipment operating in extremely cold climates. It is recommended for of Caterpillar TO-4 for cold weather application and Allison C-4 specifications. This multifunctional fluid is suitable for use in transmissions, final drives (excluding applications requiring Cat FD-1), hydraulic systems, and wet brakes, but not recommended for engines.

Formulated with high performance synthetic base oils and advanced additive package, Purus Arctic Synthetic TO-4 fluid delivers superb equipment protection and performance across a wide temperature range. It minimizes deposits on critical components, enhances yellow metal protection, and increases load-carrying capacity for greater durability and reliability. Its optimized frictional properties ensure 
smooth, consistent clutch engagement, excellent wet brake performance, and outstanding compatibility across drivetrain components.