The Company Comotor SA was a joint venture between NSU and Citroën, created in Luxembourg in April 1967. Its goal was to produce Wankel engines. It followed an earlier, 1964 joint venture of both companies, the Geneva-based Comobil subsidiary, focusing on the development of the engines. Comotor engines were used by the Citroën M35 and by the GS Birotor. In 1969 the company purchased a large 850 000 m² plot of land at Altforweiler, half an hour to the east of Luxembourg in German Saarland in order to build a factory.