I owned acura integra,Toyota Corolla and Mitsubishi Lancet evolution 8,driving Japanese cars is much easier, cheap to maintain and check engine light barely turn on. Before I buying any type of cars i do my research on Edmunds consumer review and how this people rate the 2006 audi a4 "great car" is a lie because first year of owing it in had nothing but headaches on repairs and terrible gas mileage on a stock car(normal driving). I do my regular oil change 3k miles,transmission fluid flush at 100k and do most of the repair myself and check engine light never ends, after fixing one thing a different check light codes pops up. I spend $2000 in oem parts within the last 3 years owning it,cam followers,pcv valves,brake booster hoses,spark plugs coil packs all replaced. Interior is also falling apart my glove compartment hinges replaced ,center console arm replaced, passenger back window motor replaced,window button peeling off replaced, rear back seat cup holder won't open i think the spring is damage inside to pop out. Overall this 2006 a4 is garbage and I won't be owing any audi a4 ever again.
I bought the car scared of having huge maintenance costs, however. it has cost me less than my Honda Odyssey. All i needed to do were a oil change, tires, and a cracked windshield. Find one well maintained and you'll be set. Drives like a dream.