I'm new here. So I just got my first Audi. 2005 A6 3.2 V6 in Navy. It has ~100k miles but the mechanics all said it was in great shape and well cared for. Just replaced the spark plugs and a few minors. Any suggestions of relatively inexpensive upgrades? I really need to make sure the car is reliable as I will probably own it for a while. Also any suggestions on cleaning products? (I REALLY prefer clean cars so I've always gone the extra mile in the past).