Yamalube 10W-40 4 STROKE MOTOR OIL part number : 90790-BS456 Packing Size: 4Liter Dijamin 100% Original/Guarantee 100% Original Outboard 4 stroke motors work harder than automotive motors. They require more protection than regular automotive oils can give. Yamalube 4 stroke Outboard Oil is formulated with special additives selected premium base oils to provide the best protection for Yamaha 4 stroke outboards motos. EXTRA BENEFIRS OF YAMALUBE 4 STROKE MOTOR OIL - Extra protection against corrosion under harsh marine environments. - Lower friction for easy start up. - Extra protection from oil break down under high load. - Additional wear protection. - Excellent motor cleanliness