Klotz 100% Full Synthetic Automotive Assembly Lube - 12oz - Assembly Lubricant for Automotive, Marine, Snowmobile, Motorcycle, and Kart Engines - KL-311. Provides required lubrication during the extremely important first start-up to extend engine life and efficiency. Will seat piston rings quickly and properly. Coats engine components with a protective film to prevent metal-on-metal contact. Burns off clean and quickly after the first startup. Fortified with anti-oxidizers and rust inhibitors . Ashless, leaves no carbon deposits. Protects rebuilt engines during storage.