Will prevent rust from forming on internal engine surfaces whenever an engine sits idle for extended periods of time Storage Seal is specifically formulated for use with 2 and 4-cycle gasoline engines and forms a protective barrier against rust on internal metal surfaces Use before putting your engine in storage at the end of the season or whenever it will not be used for more than a month 12 oz. Brand new, genuine Mercury Marine / Mercruiser Storage Seal Fogging Oil 12oz.. This is a factory original equipment part, not aftermarket. Fits: Please Verify Own Fitment.