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Specially engineered for marine engines, AMSOIL 10W-30 Synthetic 4-Stroke Marine Engine Oil is a premium synthetic formulation designed to withstand the heat and stress of high-rpm operation and deliver excellent wear protection. It protects against rust and corrosion during periods of inactivity and long-term storage to keep inboard and I/O engines protected, even when not running. AMSOIL Synthetic Marine Engine Oil’s naturally strong base oils resist viscosity loss due to mechanical shear.

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