I put cheap DEX III in my e30 but the second the temp drops below 32 deg the power steering pump whines under load until it gets to temp. Most of the time I know I’m going to have to drive somewhere so I go out and start it to let it warm up for 5-10 minutes before I drive. But, of course there’s always times when I have to hop in the car and go somewhere. I flush the system every other year or so. I am just wondering if anyone ever puts anything else in the system either just for the winter or if there is a product like oils that is engineered to have a different viscosity in lower temps.