My ebay Elsawin is full of holes. I actually found references both DQS and FRF gearboxes, but when I go into the actual repair manual the entire transmission section is missing. Maybe someone with a better copy of Elsawin can find out. Definitely the list I posted earlier does not cover all A6 01Es.
I could be wrong but at least the DQS transmission appears as an option when I select the A6 2.5 tdi quattro as the vehicle model so it does appear to be a 6 speed. Also found this site, if its accurate it appears to be a 6-speed but with wrong final drive.
S8 is definitely 4.111 final, code EUU is 4.111.
http://workshop-manuals.com/audi/a4_...nd_capacities/
