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Motor Oil - 25W-40 - One Gallon It's an exclusive formulation engineered to provide superior lubrication and corrosion protection for 4-cylcle marine engines. This unique 25W-40 multi-viscosity oil contains no viscosity improvers, which could shear down, leaving you with reduced engine protection. Increased concentrations of detergents, anti-oxidants, anti-wear and corrosion inhibitors provide protection that is superior to most standard 4-cycle automotive engine oils. Continued use will reduce wear, scuffing and scoring of internal engine parts, keep pistons clean and rings from sticking, and protect internal engine parts from corrosion. Meets and exceeds API service requirements for SJ, CF-2, CH-4 with a multi-functional additive that assures "Marine Grade" oil performance and provides warranty protection for all Mercury Mercruiser engines.