When your engine runs hard, you need oil that won’t back down. AMSOIL Synthetic High Zinc Motor Oil is built tough for engines that demand extra wear protection. With elevated levels of zinc and phosphorus, this oil provides a strong defense for flat-tappet cams, high-tension valve springs, and other high-pressure components. It resists viscosity breakdown, runs clean under high heat, and supports longer drain intervals in both gas and diesel engines.
Ideal for: High-mileage vehicles, flat-tappet engines, wet-clutch systems, motorcycles, and applications requiring 10W-30, 10W-40, or 20W-50 high zinc motor oil.
