Surf City Garage 517 20W-50 Vintage Car Motor Oil, 1 Quart Vintage Car Motor Oil, the #1 Engine protection for all pre-1985 vehicles 2000 PPM Zinc for maximum camshaft protection Formulated with a unique blend of conventional base oils and performance additives to help prevent and even correct minor oil leaks Enchanced detergent and dispersant levels to protect from rust and corrosion that can occur during prolonged storage. Also used to reduce sludge buildup left behind from years of using inferior oils