Shell Spirax, QT, 80W90, Heavy Duty Gear Oil, High Performance, Multi Purpose, Manual Transmissions & Oil Lubricated Wheel Bearings, Drive Train Gears Of Heavy Duty Automotive, Trucking & Off Road Equipment, Operated Under High Speed, Shock Load, High Speed, Low Torque & Low Speed, High Torque Conditions, Protects Hypoid Gears Against Wear & Scuffing, Multi-Viscosity For Year Round Use Over Wide Temperature Range, Contains A Sulfur Phosphorus Additive System For Excellent Load Carrying Capacity, Additives To Inhibit Oil Oxidation & Keep Lubricated Parts Clean, Inhibitors To Protect Against Corrosion, Rust & Foaming, Compatible With Other Automotive Gear Oils.