New C300 or Audi A4
http://www.germancarzone.com/pit-gen...r-quality.html
http://www.germancarzone.com/c-class...9-audi-a4.html
Maybe this can help you…neverthless I would go to the dealer, make a testdrive etc…
. My personal opinion of Audi is not very high because we've had two A4's in the past 1998-2006 with some reliability isssues. All of the problems were electrical or cosmetic. However, I understand that those years were Audi's dark ages. Have you considered the BMW 3-ser as well as the Cadillac CTS?
Honestly, if you drive them back to back, I think there is no comparision...
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Like I was saying about the little half baked things...The Audi's speedo goes to 180MPH and only covers about 2/3 of a full 360 degree sweep. Therefore, in everyday driving 0-60MPH only covers about 20-25% of the sweep. Way too small to be able to quickly glance and see how fast you are going. Also, the entire instument panel is tilted too far up. You cannot see the bottom portion of the gauges unless you lean up and forward...these are problems discussed in some of the Audi forums. Just seems like the whole car has way too many little issues like this...
It appears new 2010 A4 is only available with 4 cyl turbo, which i found had a rough, cheapish idle.
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AFAIK the C300 v6 is port injected, while both newer Audi engines are direct injected. For the long haul (buyers vs leasers), direct injected engines may have severe fouling of valves and ports at high milage, due to egr and pcv action.
Plus, you're in the w204 forum lol...my money is on more votes for the w204. Of course it would be the opposite if you went to a A4 forum.
I drove both and I've always hated Mercedes but loved Audi. After getting out of the A4, it wasn't the car I always thought it was and the Benz was more than I ever thought it was.
Different cars IMO. but from the 2 days I've owned the car the fit and finish and the feel of the car is completely different in the mercedes. I don't know if its just the new car, but it feels so solid. Thats the only word I can use to describe it. Sitting inside (to me at least) I feel like I'm in more than an entry level car.
We have owned many mercedes, audi and bmw in my family. Not really biased here, cuz I still have an infatuation with audi.

Materials, fit and finish were nicer in the A4. The base A4 has black trim around the windows which differentiates it between the higher trims; the C looks the same regardless of trim. This may not matter to you but looking at both cars in white, the C just looks more expensive with the chrome/silver bits. The A4 looked very "base" model.
I ended up with the C because the A4 without the sport suspension setup has a very "floaty" ride. The C felt lower (because it is) and more planted on the ground. Unfortunately, neither car handles like my old Subaru






