Hi I’m thinking of buying my first A6 and looking at a 2012 3.0TDI Quattro s Line Avant with S Tronic gearbox with 93k. What do I look for as I’m coming from a A4 1.8t quatttro with manual gearbox so this is completely different. It has a full Audi service history and all the gadgets but how reliable is the 3.0 v6 TDI engine and the S Tronic gearbox? Also is it possible the change the front bumper to the facelift one? Any comments and help would be great