D6 | Black |
D6 is also be known as Residual Fuel Oil and is of high-viscosity. This particular fuel oil requires preheating to 220 â 260 Degrees Fahrenheit. D6 is mostly used for generators. Russian D6 is a type of residual fuel, mainly used in power plants and larger ships. Fuel oil is a fraction obtained from petroleum distillation, either as a distillate or a residue. In general terms, fuel oil is any liquid fuel that is burned in a furnace or boiler for the generation.