The Audi W12 engine coded AZC is the first production version of the Volkswagen–Audi Group’s twelve-cylinder W-configuration architecture, introduced for the 2001 model year in the Audi A8 (D2).
The Audi allroad quattro (C5) entered production in 2000 following the debut of the Audi allroad quattro concept at the 1998 North American International Auto Show in Detroit.