Torco MPZ Plus engine oil additive is engineered to protect the engine and the motor oil. It forms an anti-wear boundary layer between hot metal components that does not wash, rub, or burn off to protect your engine, while the oil is protected by significantly enhanced anti-wear, antioxidant, and corrosion inhibitors. MPZ Plus significantly reduces friction wear and protects bearings from varnish and sludge. Torco MPZ Plus is catalytic converter and O2 sensor safe, and will improve fuel mileage, increase horsepower, and extend your engine's life.