AC service not under warranty
I also got C300 for loaner and I did felt that it is slower than my C350 and seats are softer. Also OEM contis really bad on C300, but it is good automobile. Also, I would not probably not buy MB unless it is AMG and would prefer BMWs.
Although the 2012 C350 gives more than 300 HP (still naturally aspirated) and the C250 CDI should get some good reactions, with more torque than the current C300 from a 1.8L twin turbo.







