PS fluid options for 123

[Kyle Blackmore]

After reading posts for an hour I think I'm more confused now than usual.I want to change the filter in my PS pump and flush the fluid, MB dealer wants $15 Cdn for 1/2 a liter of MB PS fluid. I know not to use ATF fluid (thanks Larry , MB DOC , etc.)but there seems to be a difference of opinions on PS fluid (non MB)or Hydraulic fluid . My 123 has 400,000 km and doesn't leak PS fluid now , nor do I want it to any time soon , so.......if MB PS fluid isn't an option.....which should I use?