Diesel engine oil for marine trunk piston engines. Mobilgard M440 is one of ExxonMobil’s premium engine oils for medium-speed trunk piston engines with extra high performance. The Mobilgard M40 series is designed to meet the needs of engines operating on heavy fuel oil, and it has very good properties for engine cleanliness, especially in the crankcase, camshaft, ring belt, and piston crown.

SAE 40, Specific gravity at 15°C 0.915, Flash point 240 °C, Pour point -6 °C, Viscosity at 40°C 143 Cst, at 100°C 14.0 Cst, TBN 40, Sulfated ash content wt% 5.0.