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 engine. Due to government regulations, in recent years oil manufacturers have removed the zinc and many other additives from their motor oils. Using an off-the-shelf brands of oil during the critical break-in process can lead to a failure. Our proprietary additive package includes optimum amounts of ZDDP and Molybdenum for protection of all internal engine components. COMP’s Break-In oil is safe for both flat tappet and roller valve trains, and in addition our oil improves surface mating of rotating assembly parts.