COMP Cams Camshaft Break-In Lube Case ODue to government regulations, in recent years oil manufacturers have removed the Zinc and many other additives from their motor oils. Using one of these "off the shelf" brands of oil during the critical break in process can lead to a failure. Thus, COMP Cams Engine Break In Oil and Additive are designed to extend the durability of internal engine components including Camshafts, valve train components and all moving parts in your new or rebuilt