According to the MB website all 2013 C300's now have a 3.5 liter engine, but it has less HP and worse fuel economy than the C350 or the E350. What are the differences in these two 3.5 liter engines? Both are direct injection. I have also noticed that in Minneapolis two of the Merc dealers are listing the 2013 C300 as having a 3.0 liter engine like they didn't notice the engine upgrade. I have scanned W204 post and no one mentions that the new C300 is a full second faster 0-60 than the old 3.0 liter C300, again according to the official MB site. I think the c300 just became a more interesting car to own in 2013.