YAMAHA Yamalube Oil 4 Stroke 10W-40 Carton of 24 Pieces Yamaha Yamalube 4 Stroke 10W-40 API-S Motor Oil is pure lubricants enriched with superior formula to increase engine efficiency, provides maximum lubrication and anti-corrosive for your Yamaha outboards.It helps to protect important parts of your outboard engines and keep engine cleanliness optimum.