Fully synthetic formulations created from polyol ester/PAO bases offer excellent lubrication in extreme conditions. High viscosity index (VI) to provide relatively constant viscosity and film thickness with variable temperature changes Ester/PAO bases and friction modifiers provide additional slipperiness for lower operating temperatures by reducing sliding friction in hypoid gears. Exceeds API GL-5 specifications Designed to provide the highest degree of protection and improved differential efficiency for better mileage, longer drain intervals and less wear. Fully synthetic formulations created from polyol ester bases offer excellent lubrication under extreme conditions. Ester bases and friction modifiers (except NS) provide additional slipperiness for lower operating temperatures by reducing sliding friction in hypoid gears. High viscosity index (VI) to provide relatively constant viscosity and film thickness with variable temperature changes Superior shear stability and reduced oxidation compared to other synthetic and conventional gear oils. Exceeds API GL-5 specifications Designed to provide the highest degree of protection and improved differential efficiency for better mileage, longer drain intervals and less wear. API GL 5+ Service Class SAE Viscosity Grade (Gear Oil) 75W90 Vis @ 100°C, CSt 16.1 Vis @ 40°C, CSt 108 Viscosity index 161 Pour point, °C -45 Pour Point, °F -49 Brookfield Viscosity, Poise 1100 @-40°C