Welcome to the forum. I am pretty sure that using other than the Mopar (or equivalent) Power Steering fluid CAN cause problems with the rack and pump. Personally, I use nothing but Mopar Power Steering Fluid+4, P/N 68218064AB meeting MS9602 standards. It is suppose to be a fill for life fluid that doesn't require replacement unless there may be a component failure. In over 16 years of ownership of up to 3 DCX/FCA vehicles, the only time I've ever had to add fluid on any of them was when I replaced the pressure hose on my 06 300C SRT8. It had 164K on it at the time.