On average, the 2013 Audi S6 starts to “feel” problems with the FUEL/PROPULSION SYSTEM and its various aspects after 45 000 miles.
Recently reported FUEL/PROPULSION SYSTEM problems on 2013 Audi S6
Oem turbos fail due to oil starvation , caused by oem oil strainer and pvc valve ( several revisions have been made since cars was produced ) also numerous others have had the same issues