This 16 oz. bottle of Lucas Oil 10063 is an engine break-in oil additive with TB Zinc-Plus. It is specially formulated to provide the necessary protection during the crucial engine break-in period. This product is designed to be used in engines with flat tappet cams and will provide superior wear protection. Lucas Oil 10063 contains high levels of zinc and phosphorus additives that help improve the longevity of engine parts and reduce wear on critical engine components. It is compatible with all petroleum-based and synthetic oils.