Synthetic blend four stroke oil 8M0116451 is for use in all four stroke outboard stern drive and inboard marine engines. It is SAE 25W40 weight oil. Provides outstanding wear and corrosion protection to help extend engine life. Meets or exceeds all marine engine manufacturer s warranty requirements and recommendations for use of an FC-W marine engine oil. It maintains its viscosity protects against varnish buildup and sludge formation and exceeds the rust protection requirements for NMMA certification. Outperforms automotive oils in marine applications because of its specialized additive package designed for marine engines and the rigors of the marine environment. This package is a one quart bottle. See your owner s manual or service manual for specific applications and instructions. The Quicksilver brand is the leader in delivering uncompromising engine oils parts and accessories to the marine industry for over 65 years. It has earned a loyal following by providing the highest quality products that are tested through some of the most rigorous environments and testing procedures. No aftermarket company comes close to the level of research and design as Quicksilver; buying Quicksilver is buying performance protection and peace of mind.