The longitudinally mounted rotary engine had a nominal capacity of 995 cc delivering 49 bhp (37 kW; 50 PS). According to factory figures the car had a performance roughly on a level with that of a Morris 1300. The engine was supplied by a company formed in 1967 by NSU and Citroën called Comotor.
The M35 was an experimental vehicle and was not officially sold - rather it was supplied to loyal Citroën customers to get their comments on the usability of the design. Many aspects of the M35 made it to regular production. The rotary engine was deemed satisfactory and a dual rotor version of it was used in the GS Birotor in 1974; the gearbox used in the M35 was the GS 1015’s gearbox (albeit with a normal shift pattern); certain suspension parts found their way into the GS line when it was introduced in 1970 and the seats that reclined just above the waist were found in none other than the SM.