For use in all brands & types of 4-stroke marine engines including: Outboards, High Performance, Stern Drives/Inboards, Personal WatercraftExceeds all Marine industry 4-Stroke oil requirementsFlagship 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.