The 1999 audi has really been one of the best cars i have ever owned and i have owned a lot in the past. The reliability of it has been very good i got it with 116,000 on it and it now has 153,000 with only one little problem in the middle of the mileage. It was a valve cover gasket, just leaking a little bit of oil, not a big deal replaced it myself in just under a hour. otherwise haven't had any other problems. the 1999 audi is a great car for someone who cares about cars and knows how to maintain a car.
I bought the car used with 70,000 miles and have somehow managed to put 35,000 on it in a year and change (still trying to figure out how I did that). Even though I bought it with the expectation of putting some money into it, I had no idea that I'd put in almost $5000 for a number of various problems. Valve cover gaskets were replaced, new tires, front axles, new control unit, and assorted other things. Unless you have the tools and the know-how to do a lot of the work yourself, I'd recommend looking elsewhere.
The 1999 audi a4 2.8 wagon is on of the best cars i have ever owned it has 147,000 on it without a single problem. The Quattro goes throw just about anything and that 2.8 has a lot of power at higher rpm but down low is not bad. I do all my own servicing i run amsoil in it and it seems to like that the best. Mileage is just ok could be better.
Built in October 1998 and purchased in April 1999. This car came with the sport steering wheel and beautiful cloth seats. I added mud guards to help protect the exterior. The interior materials are very good. I've had no issues with the engine. It's unstoppable. It has the original clutch, still going after millions of shits. There's no body rust. The bad: The 99 Avants did have some front suspension issues. They were mostly covered under warranty. The rear wheel bearings need to be changed pretty frequently. The side airbags had problems too, but they're easy to replace.