Mag 1, QT, 5W20 Full Synthetic Oil, 100% Synthetic Base Oil, Dexos1 Certified To Satisfy GM Warranty Requirements, Formulated With High Phosphate Retention ZDDP For Extended Wear Performance, Even In The Most Severe Industry Tests, Keeps Pistons Cleaner Minimizing Oil Consumption & Maintaining Power & Compression Performance, Maximizes Fuel Economy, Reduces Engine Sludge To Near Zero.