Sierra 18-9420-2 10W30 4 Stroke Marine Outboard Engine Oil, 32 ounce quart container. This oil is a highly refined petroleum product formulated with premium base stock and highly refined additives. It has excellent anti-wear characteristics, reduces friction and is formulated to offer maximum corrosion protection. It also reduces sludge to keep engine cleaner for better efficiency and has low temperature viscosity to offer better cold starting. Specifically formulated to meet or exceed the tough requirements of the Marine 4-stroke motor manufacturers, Mercury, Yamaha, Johnson-Evinrude, Suzuki and Honda. Meets and exceeds quality performance API SJ, CF-2, CH-4. Sold by each.