Mercury 8M0184390 20W40 4-Stroke Marine Engine OilGenuine OEM Mercury-Mercruiser part.This Mercury 20W-40 blend 4-stroke engine oil features additives specifically designed for use in marine engines. This oil can be used in any marine engine equipped with or without a catalytic converter and will not damage emision systems. Mercury oil helps maintain peak engine performance as well as reliability by helping to eliminate thermal breakdown under extreme rpm. temperatures, and loads.Need to know how much oil you need? Check out our Mercury and MerCruiser oil capacity guides for more information!Features: Exceeds FC-W and oil requirements; 20W-40 Blend 4-Stroke Engine Oil; 1 US Quart (32 FL OZ); Eliminate Thermal Breakdown; Wear and Corrosion Protection;