Well, I just remember I actually have a .pdf users' manual for 1997 Tahoes and there is a list of fluids and lubricants in page 7-49: power steering pump should use
"GM Power Steering Fluid (GM Part No. 1052884 - 1 pint, 1050017 - 1 quart, or equivalent)".
Quick running of part numbers on Ebay yields the following results:
https://www.ebay.com/sch/i.html?_fr...0.XGM+1052884+.TRS0&_nkw=GM+1052884+&_sacat=0
So it's either "Divinol Zentralhydraulikfluid S" from Germany (no details on shipping to my country specified) or "REDLINE OIL 30404 Power Steering Fluid full synthetic" (from a seller in Germany, 1 quart plus shipping to Slovenia costs 45 UDS or 37 EUR).
Anybody have experience with the Red Line fluid, and how much of it does a power steering pump on GMT400s take?