Mobilgard? 12 Series high-performance diesel oils are designed for use in marine trunk piston engines operating on low sulphur distillate fuels. The oils are compatible with ExxonMobil Premium ECA category fuels. They provide outstanding corrosion and wear protection, as well as helping engine cleanliness and water separation properties.Mobilgard? 312 and Mobilgard? 412 are particularly effective in small bore, high-speed engines in fishing fleets; in new, severe service engines; and in many types of medium-speed engines.