What are the consequences of mixing power steering fluids?
3 Answers
Mixing power steering fluids can accelerate oil degradation and increase mechanical wear, potentially leading to mechanical failures. Power steering fluid is a special liquid used in the vehicle's power steering pump, which utilizes hydraulic pressure to make steering significantly lighter. To prevent contamination or deterioration of the power steering fluid, it is recommended to replace it every 2 years or 30,000 kilometers. Power steering automatically provides additional steering force when the driver turns the wheel, thereby reducing the driver's steering effort. Power steering oil is a medium oil added to the power steering system, serving to transmit steering force and provide cushioning.
I once had a troublesome experience with mixing power steering fluids. That time, I accidentally mixed two different brands of power steering fluid. At first, I didn't pay much attention, but gradually, the steering became heavier, and it felt like the steering wheel was glued—turning it required much more effort. When I took it to the repair shop, the mechanic said the fluids had reacted, creating bubbles and sediment, which drastically reduced lubrication and even corroded the hydraulic pump's seals. In the end, I spent nearly two thousand yuan to replace the pump and flush the system, not to mention the days I missed work. Since that lesson, I've made it a habit to only use original or the same type of fluid. Mixing might not show immediate problems, but over time, it accelerates component wear. Replacing an entire steering system is far more expensive, not to mention the safety risks. It's not worth saving a few bucks on fluid and risking major trouble.
As someone who loves DIY car repairs, I often remind my friends about the significant risks of mixing power steering fluids. Different brands contain varying additives, and mixing them can trigger chemical reactions, such as forming gels or sludge, which can clog the hydraulic circuits, leading to sticky steering feel and increased noise. In severe cases, it can damage the power steering pump and steering gear, with repair costs ranging from hundreds to thousands. If accidental mixing occurs, my advice is to stop the car immediately and avoid driving it. Drain the old fluid, thoroughly flush the system with a cleaning agent, and then refill with the correct matching fluid. During routine maintenance, always note down the fluid brand and specifications, and double-check the label before adding to avoid such mishaps. Safety first—steering failure is no joke.
