The ultimate in camshaft protection for your classic and racing motors! Don't allow stricter E.P.A. standards lead to the premature deterioriation of your engines. ZDDP Maxx replenishes the much needed zinc and phosphorous in your oil to keep your non-roller lifters from early deterioration. Simply add one 2oz bottle of ZDDP Maxx to 4 or 5 quarts of your favorite oil, and for racing engines, add 1oz per quart Manufactured by ZDDP MAXX for ZDDP Maxx. Turbo maxx oil additive doubled oil change intervals stops stiction cleans the engine stops friction and wear better than any product.