Fuel oil is a fraction obtained from petroleum distillation, either as a distillate or a residue. Broadly speaking fuel oil is any liquid petroleum product that is burned in a furnace or boiler for the generation of heat or used in an engine for the generation of power, except oils having a flash point of approximately 40 °C (104 °F) and oils burned in cotton or wool-wick burners. In this sense, diesel is a type of fuel oil. Fuel oil is made of long hydrocarbon chains, particularly alkanes, cycloalkanes and aromatics. The term fuel oil is also used in a stricter sense to refer only to the heaviest commercial fuel that can be obtained from crude oil, i.e., heavier than gasoline and naphtha.

Fuel oil is used for stationary boiler plants and process units. Manufactured on the basis of residues of atmospheric and vacuum distillation with adding of heavy gasoil cuts.


                Name of characteristic

GOST 10585-99

Rated value for M-100 grade

Kinematic viscosity at 100 0C, m2/s (cSt), max.

50,0·10-6 (50)

Ash content, %, max for fuel oil:


with low ash content


with medium ash content


Sulfur content, wt %, max, for fuel oil:


type IV


type V


type VI


Pour point, °C, max