YAMALUBE 05W30 4M FC-W® Full Synthetic SAE 5W-30

Group IV fully synthetic oil offers our best outboard lubrication and performance, and it’s FC-W® rated by the National Marine Manufacturers Association (NMMA®). Contains all of the benefits of mineral oil-based Yamalube 4M, with increased lubricity for lower friction levels and potentially improved fuel economy. Specific marine additives help combat rust, corrosion, varnish, and wear; all while providing high levels of bearing protection, resistance to foaming, and lubrication.

Automotive engine oil will not pass the rigors of the FC-W® test. In fact, most automotive engines cruise at 2500 rpm, whereas an outboard can typically operate from 4500 to 6000 rpm all day long. That kind of stress will literally tear automotive engine oils apart. Simply put, automotive oil is not designed or formulated to provide the protection required by an outboard’s moisture-rich, high-rpm, high-load environment.

Go with Yamalube 4M.