I am looking to buy a used S4 and a 2004 S4 has caught my eye. I have never bought a used car before and have no ideas what to look out for. The car I have my eye on is an 04 reg with 114k miles. It has a full service history and has recently has had the steering rack, alternator and belt repaired. They also have paperwork for and receipts for all the work done. Anything in particular I should look out for?