Gasoil is an intermediate product in an oil refinery that is heavier than diesel but lighter than lube oil or residual fuel. It can be a feedstock to make lubricating oils such as motor oil, or it is often converted into lighter, more valuable products such as gasoline or kerosene by a cracking process. Heavier gasoils produced by vacuum distillation called vacuum gasoils are usually feedstock for catalytic cracking. Lighter gasoils from the main crude distillation column that runs at near atmospheric pressure are often called atmospheric gasoils and are fed to a hydrocracker. View of the Shell/Valero Martinez oil refinery An oil refinery is an industrial process plant where crude oil is processed and refined into useful petroleum products. ... Diesel is a product used as a fuel in a diesel engine invented by Rudolf Diesel, and perfected by Charles F. Kettering. ... A lubricant (colloquially, lube) is a substance introduced between two moving surfaces to reduce the friction and wear between them. ... Residual fuel is any petroleum-based fuel which contains the undistilled residue from atmospheric or vacuum distillation of crude oil. ... Motor oil is a type of liquid oil used for lubrication by various kinds of motors, especially internal combustion engines. ... In petroleum geology and chemistry, cracking is the process whereby complex organic molecules (e. ... Vacuum distillation is a method of distillation whereby the pressure above the solution to be distilled is reduced to less than one Atmosphere (unit) causing evaporation of the most volatile liquid(s) (those with the lowest boiling points. ... In petroleum geology and chemistry, cracking is the process whereby complex organic molecules (e. ... diurnal (daily) rhythm of air pressure in northern Germany (black curve is air pressure) Atmospheric pressure is the pressure above any area in the Earths atmosphere caused by the weight of air. ... In petroleum geology and chemistry, cracking is the process whereby complex organic molecules (e. ...