Hydraulic oils of mineral base with antiwear and anticorrosion additives. They are applied as fluids for the transmission of power and motion in all hydraulic systems at normal operating temperatures. It lubricates moving elements: wing, axial, piston and gear pumps. It does not have adverse effect on parts made of non-ferrous metals, there is no distruction, dissolving and swelling of the usual sealing materials from rubber and plastic. These oils are also used for the lubrication of small and slightly-loaded closed gear transmissions. It is particularly filtered to meet stringent oil purity requirements according to NAS 1638.