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Quicksilver's 4-Stroke oil technology outperforms automotive oils in marine applications because of it's specialized additive package designed for marine engines. This new mineral 4-Stroke oil is also now approved for use in all Outboard engines; previously only our synthetic blend could make this claim. 10W40 is recomended for certain operating temperatures and manual start applications. For use in all 4-Stroke marine enginesExceeds all Marine industry 4-Stroke oil requirementsFlagship engine and corrosion protections-Industry leading strength and viscosity retention and ultimate corrosion and wear protectionThe most recommended marine oil-over 5 years of engineering and development