I have a 2004 Volvo S60 2.5T, which needed its power steering fluid topped off. The owner's manual simply states "ATF", so that's what it got, and the car hasn't complained one bit.
However, in follow-up I did some "research" online and now I'm confused and frightened
I read everything from "NO! Don't use ATF you will ruin the steering system" to "ATF is fine". One post says that after 2005 all Volvos use Pentosin CHF 11S or Volvo P/N 30741424 and you can tell because it's clean/green. (Well, the reservoir is black plastic and I haven't stuck my finger in it yet to find out what color it is). Anothe post says that the new fluid went into use after 1999.
Is everything ok or do I need to flush/fill the power steering lines?