Can Power Steering Fluid Be Mixed?
3 Answers
Power steering fluid cannot be mixed. The following is an introduction to power steering fluid: Reasons why it cannot be mixed: If mixed, it may cause a reaction and even damage the oil pump. Power steering fluid is a special type of oil added to a car's steering system, similar to automatic transmission fluid, brake fluid, and shock absorber fluid. Through hydraulic action, it makes the steering wheel very light and easy to turn. Power steering fluid replacement cycle: Under normal circumstances, power steering fluid should be replaced every 2 years or 40,000 kilometers. If the car uses an electric power steering system, there is no need to replace the power steering fluid, as the electric power steering system does not require the use of power steering fluid.
Speaking of the issue with mixing power steering fluids, I recall a lesson I learned the hard way. One day, my steering system started making strange noises, and I casually added a leftover bottle of fluid from another car model. As a result, the steering wheel became increasingly heavy, and eventually, the pump failed. When I asked at the repair shop, they explained that different brands of fluid have varying viscosities and conflicting additives, which can corrode internal components when mixed. That repair cost me over two thousand yuan, and I deeply regretted it. Now, during every maintenance session, I strictly use the same type of fluid recommended by the manufacturer to avoid any mixing. Actually, checking the fluid is quite simple—just remove the reservoir cap to inspect the color and level, and replace it regularly. I advise everyone not to cut corners for convenience; maintaining consistency is the way to safety.
Never mix power steering fluids, as they are formulated differently, just like blood types for the heart. Common types include mineral or synthetic, each with specific anti-wear and seal protection additives. Random mixing can cause fluid separation or viscosity changes. Last time, my friend’s pickup truck mixed regular engine oil, and the steering pump wore out, making the entire steering system sluggish. Repairs weren’t cheap—replacing the pump and flushing the lines. It’s best to refer to the owner’s manual for specifications, such as ATF or PSF types, and ensure consistent fluid additions. By the way, the reservoir has MAX and MIN lines—top it up with the same fluid when low, don’t wait for issues. Developing a checking habit saves big trouble.
