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For use in all 4?Stroke Marine Engines ? New formula 4?Stroke oils are engineering approved for all marine 4?Stroke applications, including: Outboard, MerCruiser, High Performance, Stern Drive/Inboard, and exceeds all Marine industry 4?Stroke oil requirements.Flagship Engine and Corrosion Protection ? Industry leading strength and viscosity retention and ultimate corrosion and wear protectionThe most recommended Marine Oil ? Over 5 years of engineering and development by the largest marine engine manufacturer in the world. Sold in case packs only.