The motor itself is also as clean as they come. It always starts on the first turn of the key and runs magnificently. Made from cast iron, the M117-V8 is arguably the most dependable Mercedes V-8 ever made. Without black boxes and oodles of electronic emission controls that give nothing but headaches, this solid engine behaves very much like a 'good old' V-8 from Detroit, but it is, of course, much more refined.