Quicksilver Heavy Duty Diesel 15W-40 Engine OilThis Genuine OEM Mercury-Mercruiser Heavy Duty 15W-40 Engine Oil has been formulated to meet the designed needs of marine diesel engines and provide superior protection.Need to know how much oil you need? Check out our Mercury and MerCruiser oil capacity guides for more informationFeatures: Fights varnish and sludge deposits; Controls soot, deposits, and oil thickening; Protects internal components from wear and corrosion; Excellent shear stability to assure stay-in-grade performance; Meets OEM approvals for Volvo VDS4; 4 Liters (1.06 US Gallon); Provides protection for Mercury Mercruiser diesel applications; Do NOT use in 2-cycle outboards or Mercury Mercruiser gasoline engines