What oil for yanmar yse12?

For the Yanmar YSE12 engine, it is recommended to use a high-quality marine diesel engine oil with a viscosity rating of SAE 15W-40 or 10W-30, depending on the operating temperature conditions. Look for oil that meets or exceeds API (American Petroleum Institute) specifications, such as CF or CG-4. Always consult the engine's owner manual for specific recommendations and oil change intervals to ensure optimal performance and longevity.