Want to know more about how your engine is breaking-in or wearing? Curious about whether or not your oil is doing its job? Want to be ahead of problems that may develop? PartsVu has partnered with Blackstone Laboratories and we are now offering professional oil analysis kits. Results are typically received in a few days via email. Shop now. LUB-10W30-FC-12 - Yamalube 10W30 Outboard Mineral 4M FC-W Engine Oil Quart Yamalube 4M is a mineral-based four-stroke outboard marine engine oil that's an approved NMMA FC-W formulation specifically for use in the harsh marine environment. The FC-W rating, which sets the minimum standard for outboard engine lubrication, corrosion protection, and resistance to potentially harmful effects of oil dilution caused by fuel, provides critical assurance that your outboard's oil meets the minimum. Go it one better. Yamaha's exclusive and proprietary additive package means Yamalube 4M meets or exceeds the industry standards for lubricity and corrosion protect