The 300 SEL was only produced from 1968 – 1972 with a total production of 6500 units.
The 300 SEL outfitted with the 6.3L engine was originally a private venture by Erich Waxenberger.
This venture produced the world’s first “Super Saloon” or Q-Car. He utilized the powerful
6.3 engine at the time used in the 600 Limousine then devised a way to shoehorn the engine
into the 300 SEL body. This virtual, near two-tons land yacht could comfortably cruise at
over 124 mph with five occupants in the vehicle with the air conditioning, on! I guess you
could say that the Mercedes 300 SEL 6.3L was the very first, four-door sports car!