Lucas Hot Rod & Classic Car 10W30 Motor Oil is made specifically for muscle, showroom, classic, and trophy cars 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. And it contains the high levels of Zinc necessary to protect flat tappet cams, lifters, and pushrods. The Lucas additive package protects against rust, corrosion, and dry starts associated with long periods of non-use.