1.8t in an Audi isnt more to maintain than a 1.8t in a Golf. You change the oil, you do the plugs...you do the timing belt at 100k and your good. The 3.0L you dont have to worry about a turbo going bad. My Audi (one that is known to be a PITA) has been very cheap to maintain. I have 130K miles on it and I've replaced a belt tensioner, ball joints and torn CV boots and I need to do my wheel bearings here soon, all of which are normal wear items. Other than that its just regular maintenance.