This upper cylinder lube is a powerful blend of oils and additives that contains no solvents. Lube is designed to increase power and fuel mileage and also lower exhaust emissions through a more complete combustion. It gives your fuel system what it really needs - a blend of super slick oils and additives with a high detergent action that allows the engine to operate at maximum efficiency. The lubricant also cleans and lubricates the carburetor and injectors and causes the fuel to burn more thoroughly for increased power and less fuel consumption. Lucas Fuel Treatment should definitely be used in vehicles that require leaded fuel, because it actually replaces the benefits of lead in gasoline without causing harmful emissions. Plus, it totally neutralizes the harmful effects of low sulfur diesel fuel. Complies with the federal low sulfur content requirements for use in diesel motor vehicles and non-road, locomotive, and marine diesel equipment engines.