Is Power Steering Fluid Hydraulic Oil?

[TravisLee]

Power steering fluid is hydraulic oil. It is a special liquid used in the automobile power steering pump, which can make the steering wheel very light through hydraulic action, similar to automatic transmission fluid, brake fluid, and shock absorber fluid. Hydraulic oil is the hydraulic medium used in hydraulic systems that utilize liquid pressure energy, playing roles in energy transmission, anti-wear, system lubrication, corrosion prevention, rust prevention, and cooling in the hydraulic system. Power steering is a new technology in automobiles that enhances comfort, automatically providing steering force when the driver turns the wheel, thereby reducing the driver's steering labor intensity. Power steering fluid is a medium oil added to the power steering system, serving to transmit steering force and provide cushioning.

[ColtonMarie]

I've been driving for over 15 years and often deal with minor car issues. Power steering fluid is essentially a type of hydraulic oil, primarily used in hydraulic power steering systems. I remember one winter when the steering became heavier, and upon inspection, I found the fluid level was low—this meant the hydraulic oil's pressure transmission function had failed. Normally, steering fluid helps reduce the force needed on the steering wheel, making handling smoother. Without good fluid, the steering wheel can become stiff, especially when turning in parking lots, which is quite troublesome. I recommend checking it regularly yourself: under the hood, there's a reservoir—bright red and transparent fluid is good; if it turns brown or has sediment, it means it's aged and needs replacement. Don’t use other oils randomly. Some older cars can use ATF (automatic transmission fluid) as a substitute, but it’s best to follow the manual and use dedicated steering fluid. Regular maintenance, like changing it once a year, can extend the life of the steering pump. In short, this fluid is specifically for hydraulic systems—keeping it fresh makes driving much more effortless and worry-free.