Pentosin is not a replacement for ATF in traditional power steering systems as found in the 1998 Volvos. It is a synthetic hydraulic fluid for special applications.

http://www.pentosin.net/pressreleases/C ... 11S_V3.pdf

Pentosin CHF 11S is a synthetic hydraulic oil, with a green tint to it, used in special applications. For example, in our 2005 BMW e60 530i with sports package. The car has Active steering, where the steering ratio is variable depending on speed and Active Rool Stability, where the traditional front ...