Mercedes-Benz OM648 engine

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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[citation needed]

Oil specification MB 229.51 or MB 228.31 is recommended and has a service interval of 13,000 miles using the specified oil.[citation needed]

OM648 is a successor to OM613.

Technical specifications[edit]

Displacement Bore Stroke Cylinders Valves Power Torque Applications
3,222 cc (3.222 L; 196.6 cu in) 88.0 mm 88.3 mm straight-6 24 177 PS (130 kW; 175 hp) @4200 rpm 425 N·m (313 lb·ft) @1800–2600 rpm 2005 E280 CDI
204 PS (150 kW; 201 hp) @4200 rpm 500 N·m (370 lb·ft) @1800 rpm 2003-2006 E320 CDI and 2002-2006 S320 CDI