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3 years later I'll chime in with some first hand experience. The mech unit in trans and/or clutches can fail. The mech replacement can run you ~$4500. Fuel injector failure can be a big time expense as well, injectors being about $500 each and 28 hrs labor to remove the engine and do the job so there is another ~$5600 if you do only one injector. Do all 8 while you're in there and you're looking at 10k. Absurd. Valve springs, air suspension failures, active engine mount failures, etc. Audi = Actual Use Decimates Income on these if you get caught outside of warranty with one of these. I'll never go near a 4.0T again... unless roasting marshmellows over one that is on fire. ;-)
