Fune SAE 40 is recommended for marine medium speed , help anti-wear additive system resists wear by forming a protectivelayer on contact surfaces under all service conditions,Metallic detergent and ashless dispersant additive system preserves power and performance by providing very good control of high-temperature piston and ring deposits. Level of alkaline reserve ensures that corrosive acids formed by the combustion of fuel sulfur are neutralized without the need for overly shortened oil drain intervals.