With 268 horsepower, the new 3.5-liter V6 under the hood of the 2006 Mercedes-Benz C350 is the same one as found in the larger E350 sedan and M-Class SUV. More powerful and more fuel efficient than the 3.2-liter V6 it replaces, the new V6 gets the C350 from 0 to 60 mph in about 6.3 seconds when equipped with a seven-speed automatic transmission.