and frequent problems? I am looking into possibly purchasing a 2004 Audi S4 Sedan Quattro MT6 and have heard that Audis are known to not only be in the shop frequently but have high maintenance costs. Obviously costs are part of maintaining a vehicle, this goes without saying. However, are Audis particularly susceptible to frequent part failure in comparison to competitors like BMW and Mercedes? I have never owned an Audi and would greatly appreciate advice and input from someone who has, particularly a 2004 S4.