HPR Gas 10 is a premium high performance semi Synthetic SAE 10W-50, non-friction modified engine oil. It features a DOUBLE LAYER of engine wear protection with Full Zinc and Penrite's advanced EXTRA TEN technology. It contains a combination of high technology additives, including additives to prevent oil nitration and low shear viscosity modifiers. It protects against corrosion, oil oxidation and sludge under all operating conditions. For use where API CI-4/SL is required as well as for many other manufacturers requirements