I plan to do mine. It was done before by the dealer a year or so ago with the later green fluid (ZF Lifeguard 8). Before that there was blue and before that yellow (what mine had from factory).
The fluid is made by Shell, but not marketed by them, only available through Audi, ZF, BMW etc...
Find your transmission, then cross-ref the fluid in the second link.
http://www.tsgparts.net/index.php?p=...ge_id=a8_trans
http://www.thectsc.com/index.php?p=p...=184&parent=58
I have bought this oil for the diffs./final drive.
http://www.opieoils.co.uk/p-983-fuch...-gear-oil.aspx
Here is my service history, they used G060162
