Can hydraulic oil replace directional oil? In fact, the working principle of steering gear is the same as that of hydraulic system. Can you replace it?

You can't. However, I can change the composition of this oil. If hydraulic oil is used, it will accelerate the internal wear of the steering gear and affect the engine life.

Power steering oil is a special liquid used in automobile power steering pump, which can make the steering wheel light by hydraulic action, similar to automatic transmission oil, brake oil and shock absorption oil.

Power-assisted steering is a new technology to improve automobile comfort, which can automatically provide steering force when the driver turns, thus reducing the steering labor intensity of the driver. Power steering oil is the medium oil filled in the power steering system, which plays the role of transmitting steering force and buffering.