I should replace some power steering fluid in a 300E 1990

I went to Kragen today they did not know, the year of the care seemed to be the issue. I called Mercedes Benz new dealership they were not at all helpful, unless they ar ethe ones doing the repairs- that is Kearny Mesa Mercedes parts department. It is not like I haven't doen the footwaord, The reason I cam here is to get a definitve answer from someone who has a Mercedes-

regular atf is what you need. I work on mercedes all day long. Dont waste your time and money on anything else.