Edelbrock part #1084 High Performance Zinc Additive compatible with hot rods, sports cars, muscle cars and exotics. with a special formula of zinc, phosphorous and moly, it's the ideal chemistry to add wear protection to any motor oil. Because it won't rub, scrape or wear off, it is perfect for cold starts and infrequently driven vehicles. One bottle treats up to 6 quarts/liters of oil. Case of 12 qt. bottles