At a glance, the 1972 300 SEL shows itself to be a composed, beautifully appointed luxury saloon. Under the hood, however, is the biggest quad-cam V8 Mercedes built. It could push the car to a top speed of 137 mph. In utter comfort, mind you. It was, in fact, the fastest sedan in the world in 1972 and did 0-60 in 6.5 seconds. Its air-ride suspension was self-leveling based on the load. AMG was just a small local tuning company back then. They produced special competitive versions of the 300 SEL and had an impressive, albeit short, racing career. Sadly, the early seventies energy crisis meant the end of the 300 SEL 6.3. It will not be forgotten though, especially when you can wheel it anytime in Forza 4.