Give your engine the proper break-in it deserves with COMP Cams oil additives. COMP Cams Engine Break-In Oil Additive brings back the good stuff, delivering a specially engineered blend of extreme pressure break-in additives that have been removed from current off-the-shelf motor oils. Delivering added protection during the break-in process and beyond for all engine components, including the camshaft and lifters, COMP Cams Engine Break-In Oil Additive is compatible with any petroleum, synthetic, or blended motor oil. COMP Cams Engine Break-In Oil Additive extends the durability of internal engine components, protecting against premature camshaft, lifter, and valvetrain failure.