This Marine FC-W Outboard Oil is a four-stroke engine oil based on high quality base oils with special additives. Because of his excellent 'shear stability' in combination with a very strong anti-corrosion, oxidation and wear properties this four-stroke oil is suitable for use in high speed and heavy duty outboard engines as e.g. Mercury engines. This outboard engine oil meets the latest requirements set by the NMMA. The specific marine engine oil is not suitable for use in outboard engines with after treatment system and for us in cars.