Not only the most important product for proper camshaft break-in, but also extremely important at each oil change. Replaces the Zinc-Phosphates (ZDDP) removed from todays oils. Use with both hydraulic and mechanical flat tappet camshafts. Virtually eliminates cam and lifter wear at initial break-in. Dont pay for added mineral oil in some competitors bigger bottles. Max ZPM has the highest levels of Zinc-Phosphates (ZDDP) of all the popular brands tested, plus the addition of moly for extra protection. Compatible with all petroleum base and synthetic oils. Add to oil at every oil change to extend engine life and enhance performance. Just add one 4 ounce bottle for up to 6 quarts of oil.