 The M engine is an overhead camshaft engine developed jointly with Nissan, who refer to it as the MR engine.Two Diesel versions are in use at Renault as of the mid-2000s, although the petrol versions already launched by Nissan will almost certainly be used as well.Renault's N designation refers to the sourced all-aluminum Volvo modular 4-valve DOHC inline-4 -5 engines fitted in the Laguna and Safrane.