Slightly off topic, but my power steering system called for Mercon. I used this fluid, could there be any side effects? I would think not, but best to find out now before its to late.
Have done several pull and fills from power steering resevoir using Mobil 1 ATF both old and new and never noticed any difference one way or the other. Fluid looks great. Each time I suck fluid from the transmission pan I also suck the power steering and refill both.