Keep your 4-stroke outboard protected through long runs, cold starts, and hard fishing days with Star Brite Super Premium Synthetic 10W30 4-Stroke Oil, a marine engine oil that helps bass, walleye, salmon, musky, and saltwater anglers maintain strong performance in demanding freshwater and saltwater conditions. This 1-gallon formula targets 4-stroke outboard motors and also works well in high-performance outboards, gasoline inboards, and stern drives that operate at high RPMs and carry heavy loads. Shear-stable polymer additives and synthetic base stocks help maintain proper viscosity when heat, stress, and long run times push your engine hard, while the synthetic-and-organic blend supports quicker, more reliable starts at low temperatures. Its NMMA FC-W certified formula fights sludge and varnish buildup, improves engine cleanliness, and adds rust and wear protection with anti-wear additives and corrosion inhibitors that help reduce piston deposits and protect against sticking valves and rings.

• Shear-stable polymer additives and synthetic base stocks support strong protection under high stress and RPMs
• Synthetic and organic blend helps improve cold starts and maintain viscosity in harsh marine conditions
• NMMA FC-W certified formula helps prevent sludge, varnish, piston deposits, and sticking valves and rings
• Works in 4-stroke outboards, high-performance outboards, gasoline inboards, and stern drives in saltwater and freshwater use
• 1 gallon

Made in the USA

Keep your 4-stroke outboard protected through long runs, cold starts, and hard fishing days with Star Brite Super Premium Synthetic 10W30 4-Stroke Oil, a marine engine oil that helps bass, walleye, salmon, musky, and saltwater anglers maintain strong performance in demanding freshwater and saltwater conditions. This 1-gallon formula targets 4-stroke outboard motors and also works well in high-performance outboards, gasoline inboards, and stern drives that operate at high RPMs and carry heavy loads. Shear-stable polymer additives and synthetic base stocks help maintain proper viscosity when heat, stress, and long run times push your engine hard, while the synthetic-and-organic blend supports quicker, more reliable starts at low temperatures. Its NMMA FC-W certified formula fights sludge and varnish buildup, improves engine cleanliness, and adds rust and wear protection with anti-wear additives and corrosion inhibitors that help reduce piston deposits and protect against sticking valves and rings.

• Shear-stable polymer additives and synthetic base stocks support strong protection under high stress and RPMs
• Synthetic and organic blend helps improve cold starts and maintain viscosity in harsh marine conditions
• NMMA FC-W certified formula helps prevent sludge, varnish, piston deposits, and sticking valves and rings
• Works in 4-stroke outboards, high-performance outboards, gasoline inboards, and stern drives in saltwater and freshwater use
• 1 gallon

Made in the USA