Motor oils have adapted to meet the demands of newer style engines wither roller cams and no longer include the Zinc, ZDDP, or extreme pressure additives that are needed to protect the camshaft and lifters with flat tappet cams.

This 4 oz. bottle of Mr. Gasket Zinc Engine Oil Additive treats 5-7 quarts of oil and prevents scuffing, galling & provides protection for the valve-train on classic cars with flat tappet cams. It is compatible with synthetic, petroleum, and blended motor oils. Add a bottle to the crankcase of your engine at each oil change to keep your cam protected.