Lucas Oils Assembly Lube is designed to be an initial lubricant to metal surfaces. Apply to critical engine surfaces before assembly in order to prevent metal to metal contact, upon startup, before adequate lubrication is supplied. Will mix with an oil and will not plug filters. This product clings to all surfaces and is an excellent rust inhibitor, allowing long term storage for all parts. It is useful wherever tension or torque is applied. Contains Zinc, Moly, and other extreme pressure additives. Perfect for engine building or any assembly.