PEAK P4MJ53G SAE 15W-40 CJ-4 Heavy Duty Motor Oil - 1 Gallon Jug, (Case of 3) Recommended for both diesel and gasoline engines Helps control thickening and provides outstanding filterability with the newer high-soot producing emission-controlled engines Protects against varnish, sludge and carbon deposits Great for use in both on-road and off-road applications Designed to withstand shear down, even when operating under extreme conditions