The special oil for power steering of hydraulic steering machine and the oil for adding automatic gearbox are recommended for: Excellent anti-friction, anti-oxidation characteristics and mechanical stability of large trucks, light trucks and small buses; It has good adaptability with the sealing material to ensure that the transmission device is working normally; It can make the driving operation smooth and comfortable at different temperatures; Excellent high temperature stability, which can effectively prevent the formation of paint film and sediment; Excellent anti-rust and anti-foaming ability.