I purchase my A4 2.0T quattro new in 2006. Since then I have driven the car 167,588 miles. I have spent $5,800 so far in maint & repairs including tires. I have followed the maint schedule to the letter except for oil changes. I do the oil & filter every 5000 miles. The car still consistently gets 30-32 MPG. It still has the original shocks and exhaust. it will need it's second timing belt at 190,000. The timing belt is a maitenance item. Handling in the snow is effortless and safe. I am curious as to why so many bad reviews. Maybe the cars were not maintained properly from the start or abused. The bi-zeon lights had been troublesome but the dealer & Audi took care of the issue.
Many people complain about expensive maintenance. If you are like me and do your own maintenance, there is very little you have to do or pay. I have an OBD II computer that I use whenever the check engine light comes on (not often). I bought it with 55,000 miles on it, it now has 87,000. I've had to replace a coil pack (easy fix, $37 and 1 hour of my own labor), divertor valve ($150, 2 hours labor), and that is all. To change your oil, it is handy if you have the Audi tool ($100) for cartridge style oil filters (you'll have a mess if you don't), but you can make your own pretty easily out of a hose and the right diameter bottle. The car drives absolutely beautifully, couldn't be happier.
Audi got it right with this car. I have 187,000 miles on it and it runs/drives great. Paint is a little chipped from the constant driving and I hit a deer that made a dent in the driver's side door but other than that the car handles great on winding mountain roads and in the snow/rain. I change the oil every 5000 miles with full synthetic and the engine hums like new. Only complaint is changing the timing belt and water pump every 100,000 miles ($1600). I would highly recommend this car to anyone looking to pick up a used car for a teenager.
I purchased my 06 A4 BRAND NEW. Within 6 months it had to be towed...not once but twice for ignition coil failure. One time I was crossing over a large bridge and the car was chugging the second time I was stuck and the car wouldn't start. It was down hill from there. Oil leaks breather valve went, and a host of other issues. Cost me a fortune (high mileage). I don't appreciate ppl saying things about not taking care of the car. My car was beyond taken care of and it was still in service all the time. STAY AWAY. They will NOT help you or admit theres an issue even though they are aware of all these issues. I traded it in for a honda, and can guarantee it will be more reliable!!
Original purchaser, just over 5 years with not quite 60k km's/37k mi on it, all easy miles. All maintenance done by Audi per recommended schedule. Great car to drive, but expensive to maintain once OoW. Low oil pressure light/check engine light 1 month out of warranty. Known issue with oil starvation due to sludge requires a complete engine replacement - $12k. Dealer went to bat for me and Audi's covering a portion, but even so, it's more than I spent on my last 2 Ford's with twice the mileage. Clicking noises come from dash when cold due to known issues with actuators. Audi won't cover even though reported under warranty. Even basic service is 2X my Ford/Honda. Costly lesson.