Sierra 10W30 4-Stroke Conventional Marine Oil ENGINE OIL is a highly refined petroleum product formulated with premium base stock and highly refined additives. Specifically formulated to meet or exceed the tough requirements of the Marine 4-Stroke motor manufacturers, Mercury, Yamaha, Johnson-Evinrude, Suzuki and Honda. Excellent anti-wear characteristics Reduces friction Formulated to offer maximum corrosion protection Reduces sludge keeps engine cleaner for better efficiency Low temperature vi