hey are blend stocks used to formulate a variety of lubricating oils for use in engines and other machinery. Base oils are used to manufacture products including lubricating greases motor oil and metal processing fluid. Group I BASES: The main field of application of these bases is the formulation of lubricant base oils for the automotive industry, heavy industry, marine applications, and greases. These bases can also be used for the production of white oils and fluxes in the manufacturing of asphalts. GROUP II-III BASES: These oils are especially recommended in very different applications according to their characteristics, from textile and cutting oils for the lightest ones to lubricant formulations for turbines, engines, heat pumps and exchangers, and hydraulic fluids for the heaviest ones.