The M9R is a straight-4 automobile Diesel engine co-developed by Nissan and Renault. Following Renault’s designation plan the last letter (M9R) is to indicate the swept volume of 2.0 liter. Features of the diesel engines include a cast-iron block, aluminum alloy cylinder head with double overhead camshafts, 16-valve layout and a bushes timing chain. In order to reduce vibrations, balance shafts are included in some versions of the engine. The 2.0 dCi engine in all its versions complies with the Euro 4 and 5 standards for exhaust emissions.