Okay no probs. If you have researched what coding needs changing, I'm happy for us to walk through it.
As VCDS covers Audi, VW, Seat, Skoda, and some Porsche and Bentley models, your A6 should pose no problems.
Having driven one, it does a fine job. Many economy option settings. Not as fast as figures suggest.
With it being so new, I'd wait a few years for bugs to be ironed out. Even the preproduction car had software bugs.
No reason why an S3 oil change should be that different. OK sump requires 5.7 litres.
IMHO... Rip off.
With car ramp, both filter changes should take no longer than 30mins. In fact access to pollen filter is so much easier than previous A3.