The Royal Purple Max-Tuff Synthetic Lubricant is an ultra-tough synthetic lubricant. It??s designed for engine repairs builds and repairs specifically crankshaft camshaft and Rod bearing assembly. Max-Tuff utilizes unique synthetic molecules that adhere to metal surfaces to create a formidable load-bearing physical barrier between surfaces. This minimizes the possibility of boundary conditions (metalto- metal contact) and provides excellent protection to both ferrous and nonferrous metals against rust and corrosion. Features: Greater wear protection Clean efficient equipment Extends equipment life Compatible with conventional mineral and synthetic oils Non-foaming Outstanding rust and corrosion protection High temperature service capability