The Mercedes-Benz OM648 engine is a 3.2 Litre, Straight-Six (I6) 24-valve, cast iron block diesel engine manufactured by the Mercedes-Benz division of Daimler AG as a replacement for the previous Mercedes-Benz inline-5 and -6 engines.
The engine features common rail fuel injection and a variable nozzle turbocharger. The injection system operates at 1,600 bar (23,000 psi).
Power output is 150 kW (204 PS; 201 hp) @4200 RPM and 500 N·m (369 lb·ft) of torque from 1,800-2,600 RPM.
Mercedes claims this engine will propel the E320 CDI to 60 mph in 6.6 seconds. All while managing 27+ city MPG and 37+ Highway MPG
Oil specification MB 229.51 or MB 228.31 is recommended and has a service interval of 13,000 miles using the specified oil.
OM648 is a successor to OM613.