Hydrogenated base oil, high-temperature antioxidant-using imported composite additives to blend hydrogenated base oil, improve the high-temperature antioxidant performance of the oil. Developed for various vehicles, mechanical equipment transmission system, hydraulic power assist system. It has good viscosity-temperature performance, efficient transmission of kinetic energy, and avoids loss of power transmission. It has excellent anti-oxidation, anti-foaming and anti-corrosion properties, and good low-temperature fluidity. It is suitable for use in hydraulic transmission equipment and steering hydraulic system, such as hydraulic pitchers, transfer cases, couplers, etc. of various vehicles.