HFO
Heavy Fuel Oil (HFO) is a residual oil that is made suitable for driving Diesel engines by adding certain flammable substances.
MDO
Marine Diesel Oil (MDO) is a high-grade fuel of low viscosity that is used when the vessel is manoeuvring.
IFO
Modern Diesel engines are run on Intermediate Fuel Oil (IFO), a fuel whose grade lies between that of HFO and MDO.
