I have a 2008 version of the Crossfire factory repair manual. Last night I was reading about the overall operation of the steering system and there in B&W it starkly said "Do not use Automatic Transmission Fluid." So for me that brings this topic to a close. If anyone needs to know exactly the section that appears in I can find it again in about 2 minutes as I highlighted it. Until this car every one with power steering I ever owned had a power-steering rack. This being a worm & roller design, it instead works simply by moving the pitman arm. I've read some about what's best for the Crossfire since opening this topic and I've learned that you should definitely use a full-synthetic power steering fluid, specifically one that says it meets the requirements of one or more of these:
1) Pentosin CHF 11S
2) Mercedes-Benz Q1320001
3) Mercedes-Benz Approval/Specification 345.0