For use in non-catalyzed 4-stroke outboards, sterndrives and inboard engines. Delivers the marine industry's highest level of viscosity retention among 10W-30 full synthetic oils to best protect your engine"Super-synthetic" formula that resists thermal breakdown and has high levels of ZDDP additive to prevent engine wear and corrosionUpgrade safe. Compatible with mineral and synthetic-blend four-stroke oil typesWhere 10W-30 oil is recommended, it meets the warranty requirements of Mercury and other major marine engine brands, including Yamaha®, Honda Marine®, Suzuki Marine®, Tohatsu Outboards®, Bombardier®/BRP®, Nissan Marine® and Volvo-Penta® Sold in case packs only