Engineered for Superior Marine Protection Keep your vessel performing at its peak with Valvoline Marine Outboard Gear Oil 80W-90. Specifically formulated for harsh aquatic environments, this high-performance lubricant delivers smooth, reliable operation while safeguarding your gearbox and stern drive unit against extreme stress and wear. Whether navigating saltwater or freshwater, Valvoline’s advanced additive technology ensures maximum durability, optimal power transfer, and long-lasting protection for your boat’s drive system. Key Benefits Advanced Wear Protection: Formulated with extreme-pressure additives to minimize friction, heat, and gear wear under heavy loads. Superior Corrosion Resistance: Packed with rust and oxidation inhibitors to defend critical internal components against severe marine conditions. Smooth Gear Engagement: Maintains stable viscosity to ensure consistent, reliable shifting performance. Universal Marine Reliability: Engineered to meet the demanding requirements of high-rpm outboard motors and stern drives. Specifications & Compatibility Feature Details Viscosity Grade SAE 80W-90 / SAE 90 API Service Category API GL-4 Applications Marine Outboard Gearboxes & Stern Drive Units Suitable Brands Ideal for vessels specifying GL-4 80W-90 marine gear lube