Bunker fuel has the longest, largest hydrocarbon molecule … 1, 2 and 4 are used for heating and are all very similar to diesel fuels. Bunker fuel has the highest kinematic viscosity of all fuel oils and the highest flashpoint. 2 and diesel fuels, are refined from crude petroleum. Unlike diesel fuels on land that are used for cars and trucks, marine diesel oil is not a pure distillate. Difference between MDO and MGO. Fuel oil classes, including fuel oil No. Essential Difference Between Diesel Fuel, Fuel Oil, and Bunker Fuel With respect to chemical makeup, the difference between diesel, fuel oil, and bunker fuel is hydrocarbon size. Fuel oils Nos. Bunker Fuel Prices Today, IFO 380, IFO 180, MGO Prices per Ton, Live & Historical Price Charts They can be categorized as either a distillate fuel or a residual fuel, depending on their production method. The term marine diesel oil (MDO) generally describes marine fuels that are composed of various blends of distillates (also called marine gasoil) and heavy fuel oil. Bunker fuel is the generic term given to any fuel poured into a ship’s bunkers to power its engines. Re: Bunker fuel versus Diesel oil for Marine Diesels Post by marcelo_malara » Sat Mar 12, 2011 1:40 am There was a boiler, used among other things to warm the diesel oil. Of the three, diesel contains the smallest, shortest hydrocarbon chains.