The 2003 Audi A6 runs on premium unleaded (required).
The 2003 Audi TT runs on premium unleaded (required).
The 2003 Audi S8 runs on premium unleaded (required).
The 2003 Audi A8 runs on premium unleaded (required).
The 2003 Audi S6 runs on premium unleaded (required).
The 2005 Audi A6 runs on regular unleaded.
The 2009 Audi A6 runs on regular unleaded.
The 2007 Audi A6 runs on regular unleaded.
The 2006 Audi A6 runs on regular unleaded.
The 2010 Audi A6 runs on regular unleaded.
The 2008 Audi A6 runs on regular unleaded.
The 2011 Audi A6 runs on regular unleaded.