Very expensive motor to maintain. Timing belt changes will run you about $2500, and are done at every 35K, so twice as expensive, and twice as soon. Brakes will run you $1500-$1800 per axle. There are several parts on that motor that are only reachable by dropping it, so you are looking at $2000 plus to just change O2 sensors when they go out. The DRC system is about a 90% sure thing to go out on most cars over 60K miles, and is very expensive to repair. It is a great car, and a rare breed, it is what drew me to it, but after doing months of research, and talking to Audi mechanics, because of the lack of DIY work on the car, I decided to pass on it.
Good Luck, and check out
www.RS6.com for more research, you can find the good the bad, and the ugly on this beast.
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