Lucas Hot Rod & Classic Car 10W30 Motor Oil is made specifically for muscle, showroom, classic and trophy cards without catalytic converters. It provides a tougher, thicker additive film for maximum protection and lowers oil temperature. This product is compatible with methanol and all racing fuels, as well as with synthetic and non-synthetic oils. It improves the film strength between the cylinder wall and piston rings and slows oil burning and improves pressure in worn engines. Not recommended for passenger cars.