This special low-temperature hydraulic oil maintains its viscosity even at varying temperatures. The viscosity is 13,4 mm2/s at +40 °C. This oil is thus suitable for the application in hydraulic systems, e. g. in airplanes. It is resistant to pressure, oxidation and cold, protects against corrosion and has high viscosity stability. The application in low temperatures up to the pour point of -60 °C is possible.