Klotz Synthetic Assembly Lube will blend with petroleum oils and synthetic lubricants and provides needed lubrication during the critical first moments during engine start-up. It provides a protective film to prevent molecular shearing and metal to metal contact. The rust inhibitors protect machined parts during storage. Klotz Assembly Lube is an excellent lubricant for any assembly application, including differentials, transmissions, lower units, and pump assembly. 12 Oz.