You're supposed to use ATF in your power steering box.
I'm on a number of the same forums you are on and I have also seen those reports about how today's modern ATF is no longer a good choice for your power steering system. I have been using ATF in my 240D since 1982 and it has never been an issue. I'd sure like to see some actual scientific reports on why the newer ATF formulas are not good. All that I've ever seen are reports from individuals who have said that after adding modern ATF they developed a leak or a problem. Maybe their systems were ready to fail anyway and using the newer ATF had nothing to do with it. A handful of personal experiences like that certainly isn't scientific. Have you ever seen anything that supports the claim of those who say not to use the new ATF?Today's ATF contains more additives than the ATF of the 70s and 80s. Modern ATF can weaken seals in the power steering system and cause leaks. Just use some generic over the counter power steering fluid, or if you want to splurge, get the MB power steering fluid.