Competition Cams 159 Engine Break-In Oil Additive, 12 oz. Bottle Improves surface mating of rotating assembly, rod journals, piston rings, valve guides, cam and lifters, etc. Protects all internal engine components, including flat tappet and roller valve trains Proprietary additive package includes optimum amounts of ZDDP (Zinc and Phosphorus), Molybdenum and detergents Requires no additives or supplements for maximum protection Fully compatible with gasoline, methanol and high octane race fuel