Creates an anti-wear layer at friction points to prevent metal-to-metal contact and eliminate wear. Engine break-in where the new camshaft and lifters need extra protection, and ZDDP is perfect for that. Mandatory for all flat tappet engines. Works in both synthetic and standard mineral-based oils. Two fluid ounces mixed with 6 quarts of oil create a ratio of 3000 – 3200 parts per million (ppm). REV-X ZINC Oil Additive restores ZDDP levels in oil to 3000-3200 ppm when blended with 6 quarts of oil. Zinc (ZDDP) is heated; it creates an anti-wear layer on cams, lifters, and cranks. Adding ZINC during every oil change is mandatory for all vehicles with a flat tappet cam and engine break-in.