I have a 2000 A6-2.8L Quattro Avant. From what I have been looking at, I get the impression that people are recommending that Pentosin CHF 11S be used. What has me confused, is that it states specifically on the resevoir that only mineral oil be used. Yet Pentosin identifies the CHF 7.1 as mineral, and the CHF 11 as synthetic. So what gives? I really need to know ASAP what I really should be doing.

(Of course my overall rection is $%& Audi for not listing specifications! Goes along with attitude of looking up the type of commonly available brake light bulb, to be instructed to take it to a dealer[:-])

 

This is what I found online:

Pentosin CHF 11S Synthetic Hydraulic Fluid - Fully synthetic hydraulic fluid for steering and central hydraulic systems. This synthetic fluid is correct for many later models which specify synthetic fluid. Temperature range -40C to +130C. Should not be mixed with ATF fluids or other power steering fluids. ***Note - this is currently sold as part # G00200 by Audi/VW as of 1990, replacing Pentosin CHF7.1 The CHF11S is correct for Audi/VW 1990 and later models, while Audi/VW 1989 and earlier models can use either 7.1 or 11S although 11S is recommended. Audi/VW states that 7.1 and 11S can be mixed if necessary but we suggest draining and flushing the system if you are changing from 7.1 to 11S***

Jeff