Fuel oil

Fuel oil is a broad term that could refer to a number of different refined products ranging in density from kerosene to residual fuel oil. However, it typically refers to residual fuel oil or No 6 fuel oil.

Grades of fuel oil used in US markets:

  • No 1 - A fuel oil comprised of kerosene range material. Also called stove oil or range oil
  • No 2 - A fuel oil comprised of light atmospheric gasoil material. This is the fuel oil used as a home heating oil. It is very similar to diesel, but of lower quality. Typically it has a lower cetane and higher sulfur content. Also called Bunker A
  • No 3 - This is a now obsolete light gasoil range fuel oil, that has been combined with No 2
  • No 4 - A fuel oil comprised of VGO range material, intended for commercial heating furnaces lacking a preheater
  • No 5 - A fuel oil comprised of vac resid range material with a low viscosity, allowing it to be pumped without preheating. Also called Bunker B
  • No 6 - A fuel oil comprised of vac resid range material with a high viscosity, requiring preheating before pumping. Also called residual fuel oil or Bunker C

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