$300K Could Buy You Steve McQueen's 1972 Mercedes-Benz 300 SEL 6.3 3 Jun 2021, 15:21 UTC · by A once-little company by the name of AMG came to prominence with the “Red Pig” racing car. The reason two former Mercedes-Benz engineers chose the 300 SEL 6.3 as the basis of their go-faster project is the M100 engine with a cast-iron block, SOHC valvetrain, and aluminum heads. 43 photos The beefy V8 made the 300 SEL 6.3 the fastest sedan, and the allure of speed is what convinced the King of Cool to purchase one of 6,526 units produced by the Stuttgart-based automaker. A luxobarge that shames pre-Oil Crisis muscle cars with a 62-mph (100-kph) acceleration of 6.5 seconds, chassis number 10901812006395 is understandably expensive at $299,995.