I have seen a couple of 2008 A4's for sale that seem like a decent deal. I know Audi is owned by VW and they seem to make engines that are so fragile that you risk blowing them up every time you step on the gas. Do Audi's suffer from the same problems? What are the things that go wrong with these cars that should be watched for? Are they reliable? Any issues to look for or be wary of?