The Mazda Roadpacer AP (Anti-Pollution) is a full-size sedan that was sold by Mazda in Japan between 1975 and 1977, although the last car was not sold until 1979. It was based on the Australian Holden HJ and HX series Premier. Premiers were shipped to Japan without engines or transmissions, and Mazda fitted a 1.3-liter 13B Wankel engine into the bay. The Roadpacer AP has the distinction of being the only General Motors product ever to be fitted for production with a rotary engine.
The engine produced 130 hp (97 kW) but just 102 lb?ft (138 N?m) of torque, meaning the Roadpacer performed rather poorly as it weighed 1,575 kg (3,472 lb). The Roadpacer was introduced to compete with large Japanese flagship sedans Toyota Century, Nissan President, Isuzu Statesman de Ville, and the Mitsubishi Debonair. The Roadpacer's platform was the shorter version of the one used by Isuzu for the Statesman de Ville. The Roadpacer was conceived just years before Mazda entered into an engineering partnership with Ford, which materialized at around the same time the Roadpacer went on sale.