DWG Oil Treatment with our exclusive PolyGuard-1 does it all! This unique, highly concentrated conditioner improves the natural lubricating qualities of motor oil. Unlike most oil additives,PolyGuard-1™ Oil Treatment does not merely coat the inside of the engine. Instead it bonds with the motor oil, increasing the film strength of the oil itself, &amp; dramatically improving the oil stability to create a protective barrier between moving engine components.