Mag 1, QT, 80W90 Gear Oil, Exceptional Protection Against Spalling Other Wear, Especially Under Extreme Heat, Pressure Torque Operation, Ensures Long Equipment Life, API Gl5 MT1, Mack GoJ, SAE J2360, Limited Slip, Maintains Viscosity, Even Under Extreme Operating Temperatures, Resulting In Longer Fluid Life Reduced Operating Costs, Extra Resistance To Thermal Degradation Provides Superior Protection Against Oxidation Deposit Formation Significantly Prolongs Seal Life