A refinery product having different meanings according to refinery or locale Usually fuel oil Numbers 1 and 2 is diesel fuel or kerosene whereas fuel oil Numbers 4, 5, 6 or 7 is furnace oil or fuel not suitable for a motor vehicle
Refined petroleum products used as a fuel for home heating and industrial and utility boilers Fuel oil is divided into two broad categories, distillate fuel oil, also known as No 2 fuel, gasoil, or diesel fuel; and residual fuel oil, also known as No 6 fuel, or outside the United States, just as fuel oil No 2 fuel is a light oil used for home heating, in compression ignition engines, and in light industrial applications No 6 oil is a heavy fuel used in large commercial, industrial, and electric utility boilers
A liquid fuel composed of a mixture of medium-sized or heavy hydrocarbons and produced by refining crude oil Lighter varieties of fuel oil include diesel fuel, home-heating oil, kerosene, and jet fuel, while heavier fuel oils are used by industries, ships, and electric power plants to generate heat and power