Furnace oil is a dark viscous residual fuel obtained by blending mainly heavier components from crude distillation unit, short residue and clarified oil from fluidized catalytic cracker unit.These types of oils enhance combustion for melting furnaces to ensure best results in the factories. This dark, viscous residual fuel oil is obtained by blending residual products from various refining processes with suitable diluent. Usually middle distillates are used to obtain the required fuel oil grades. It is a very rough indication of the lowest temperature at which Furnace Oil is readily pump able. In the specification the pour point of Furnace oil is not stipulated. However, for Furnace oil manufactured endogenously and for imported parcels, the pour point is such that current supplies normally can be handled without heating the fuel oil handling installation.