Production years. Engine codes. M-CLASS (W164). Engine 320 CDI 4-matic (204.983) Engine codes OM 642.961 Production years 2008/06 - 2015/06 kW 165 hp 224 ccm 2987. Engine 350 CDI 4-matic (204.993) Engine codes OM 642.835 Production years 2012/07 - 2015/06 kW 195 hp 265 ccm 2987.