Top hydraulic oils of very high viscosity index for transfer of power and motion in mobile hydraulic units and stationary hydraulic systems on different equipment. Owing to very high viscosity index, undisturbed unit operation is provided within normal and extreme environment temperatures, i.e. in conditions of significant temperature changes in the environment. They have excellent antiwear properties, high thermal and oxidation stability, high shear stability, efficient anticorrosion and antirust protection, excellent filtrability, fast water separation, absence of foaming and quick air separation.