HPR DIESEL 15 is a premium high performance, semi synthetic SAE 15W-50, non-friction modified engine oil. It contains 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 increased dispersant levels and low shear viscosity modifiers. It protects against corrosion, oil oxidation and sludge under all operating conditions.