FC-W Synthetic Blend 4-Stroke Outboard Oil exceeds industry standards forall 4-stroke outboard applications that require FC-W Certified, SAE 25W-40 oil.Exceeds durability and corrosion protection required by the NMMA. This synthetic blend is formulated for small, low horsepower engines to large, high horsepower, supercharged engines. Recommended for all 4-stroke outboard applications that require FC-W Certified, SAE 25W-40 oil.Key FeaturesExceeds all marine industry 4-stroke oil requirements including FC-W and FC-W Catalyst CompatibleOffers outstanding strength and viscocity retention and corrosion and wear protection .For all 4-stroke outboard applications that require FC-W Certified, SAE 25W-40 oil