The 2012 Mercedes-Benz SLK has a 2-door, 2-passenger convertible sports car, available in two trims, the SLK300 Roadster... read more and the SLK350 Roadster.The 2012 Mercedes-Benz SLK Roadster is equipped with a standard 3.0-liter, V6, 228-horsepower engine that achieves 17-mpg in the city and 26-mpg on the highway. A 6-speed manual transmission with overdrive is standard, and a 7-speed automatic transmission with overdrive is optional.The SLK350 Roadster is equipped with a standard 3.5-liter, V6, 300-horsepower engine that achieves 19-mpg in the city and 25-mpg on the highway. A 7-speed automatic transmission with overdrive is standard powers.The 2012 Mercedes-Benz SLK Class first run in the road.Which the performance this machine can take his top speed in start of the engine. All system improve to develop this cars.