- MGO (Marine gas oil) – roughly equivalent to No. 2 fuel oil, made from distillate only
- MDO (Marine diesel oil) – A blend of heavy gasoil that may contain very small amounts of black refinery feed stocks, but has a low viscosity up to 12 cSt/400 C so it need not be heated for use in internal combustion engines
- IFO (Intermediate fuel oil) A blend of gasoil and heavy fuel oil, with less gasoil than marine diesel oil
- MFO (Marine fuel oil) – same as HFO (just another “naming”)
- HFO (Heavy fuel oil) – Pure or nearly pure residual oil, roughly equivalent to No. 6 fuel oil
Standards and classification
- IFO 380 – Intermediate fuel oil with a maximum viscosity of 380 Centistokes/500 C
- IFO 180 – Intermediate fuel oil with a maximum viscosity of 180 Centistokes/500 C
- LS 380 – Low-sulphur (<1.5%) intermediate fuel oil with a maximum viscosity of 380 Centistokes/500 C
- LS 180 – Low-sulphur (<1.5%) intermediate fuel oil with a maximum viscosity of 180 Centistokes/500 C
- MDO – Marine diesel oil.
- MGO – Marine gasoil.