This purpose-built engine oil is specifically formulated for the rigors of the high-performance watercraft engines found in WaveRunner personal watercraft and Yamaha sport boats. These high-revving, quick-throttle activation, constant-load marine engines require a robust additive system with high-quality base oils. A package not found in conventional oils. Like all factory-approved oils, this Yamalube is blended to provide advanced anti-friction protection and superior lubrication, while also helping to promote efficient fuel economy.