8. Mercedes-Benz C111 (1969)
The Mercedes-Benz C111 was a true rolling laboratory, featuring both rotary and turbo-diesel engines during its experimental life. Its wedge-shaped body and use of advanced materials like fiberglass set it apart from anything on the road.
The C111’s innovations in aerodynamics, engine technology, and lightweight construction went on to influence future Mercedes engineering and design, cementing its role as a pivotal testbed for the brand’s technological ambitions.