Due to the different viscosities and compositions of the transmission fluid, it may not provide the ideal lubrication required by the power steering system. This will cause increased friction inside the pump and pipes, and long-term use may accelerate wear and shorten the life of the pump.

In the current automotive market, hydraulic power steering systems (HPS) and electronic hydraulic power steering systems (EHPS) are still widely used, and both systems rely on power steering pumps.