The Discoverers, One Hundred Years of Solitude, One of the Best (car), One way ride, Ontario, Opel, Opel 1.2 litre, Opel 1.3 litre, Opel 4/8 PS, Opel 8/40 PS, Opel Ascona, Opel Diplomat, Opel India, Opel K 180, Opel Kadett, Opel Kadett C, Opel Manufacturing Poland, Opel Performance Center, Open Source Ecology, Open-road racing, Open-source car