Two problems related to engine stall have been reported for the 2013 Audi S6. The most recently reported issues are listed below.
2013 S6 with 64k miles suffered turbo failure while driving. The engine stalled while driving and stopped in the roadway. Numerous restarts were attempted before it finally restarted and allowed for a short drive to get off the roadway. This is not an isolated incident and there are numerous similar failures with the Audi 4. 0t engine. Audi is aware of these failures and has issued tsbs that identify the turbo oil supply line filter as the culprit but they have not issued a recall. Had this failure happened on a highway at speed it would have been very dangerous.
Failed turbos causing engine to run rich and stall out at any stops making the car inoperable at low speeds. Many reports of my2013-2016 Audi s series turbos failing/blowing out. TSB issued for such issue but no recall. Audi of America replacing with my2017 turbos that have all new parts numbers since this is a known issue with my2013-2016 turbos.