I'm not sure if Audi quote an interval for the timing belt, but I would expect it to have been done at 60-80k?
The V6 is durable, but has been known to leak oil, valley pan gasket and head gasket usually. It is sometimes possible to cure oil leaks from the head gasket, by
retorque-ing the headbolts.
The hydraulic system is the same as my 20v. They have hydraulic brake assist, so you want the (!) symbol to disappear after you use brakes first time. =pressure ok. Also after turning off engine, press brake repeatedly until it goes 'hard' ideally you should get more than a dozen, but if its less than 4-5 there is probably a problem with the 'bomb' = hydraulic accumulator.
Other things are usual 80 niggles, check handbrake holds well, also that it releases properly if possible, the mechanism is prone to siezing on the calipers.
the hyd system is shared with power steering, needs to use mineral hydraulic oil which is green. If there is red fluid (atf) in the tank, walk away, it kills the seals in the rack!
Check the windows work properly, the regulator mechanism is expensive.
I find the heater control for selecting floor/dash/screen can become stiff, causes the knob to break if forced.
look out for wet carpet, esp in the boot, the rear light clusters tend to leak, the door seals also struggle esp when the door drops a bit. This is no big deal, the hinges are adjustable, but the doorseal is £100+
Worth checking the exhaust, you have to get an original one, or have one made up at eg longlife or powerflow, also 2 cats to replace, so make sure they aren't rattling.
Can't think of anything else at the moment, see
www.12v.org also possibly
www.20v.org for more v6 and coupe info.
