Mercedes-Benz OM 900

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The Mercedes-Benz OM 900 is a series of inline, four or six cylinder diesel engines used in medium duty trucks and buses. It was launched in 1996 with Mercedes-Benz's Atego truck. The engines use a cast iron block and are available in vertical and horizontal configurations.

The engine was designed and built by Mercedes-Benz in Mannheim, Germany and was introduced to the North American market in 1998 with Freightliner trucks. In 2002, Detroit Diesel began to provide sales support, servicing, and part support for the OM 900 engines, known as the MBE 900 with Detroit Diesel.[1] Production of engines for North America was transferred to Redford, Michigan in 2007. With the introduction of the EPA 2010 emissions legislation, the OM 900 series was discontinued in North America.

In 2012, Mercedes-Benz introduced their next generation of medium-duty, commercial engines. Designated as the OM 93x series, the engines meet Euro 6 emissions levels. They feature high-pressure fuel injection and cooled exhaust gas re-circulation. A particulate filter and selective catalytic reduction further lower emissions. Variable camshaft control of the exhaust valves allows hotter exhaust gases to aid in particulate filter regeneration.

In October 2014, Detroit Diesel announced that the latest generation of the OM 900 engine would return to North America as the Detroit Diesel DD5 (OM 934) and DD8 (OM 936).[2] The DD5 was launched at the 2016 NTEA Work Truck Show, with orders to begin later that year. At the following year's NTEA show, Detroit Diesel launched the DD8. As previously, the engines will initially be built in Germany and shipped to the United States. In 2018, production would transition to Redford, Michigan.


There are six models of the engine with six displacements.

Model Cylinders Displacement Ratings Max. torque Emmissions
OM 904 4 4.3L 170 to 190 @ 2200 rpm 420 to 520 lb-ft @ 1200-1600 rpm
OM 924 4 4.8L
OM 934 4 5.1L Euro 6
OM 906 6 6.4L 190 to 260 hp @ 2200 rpm 520 to 660 lb-ft @ 1200-1600 rpm
OM 926 6 7.2L
OM 936 6 7.7L Euro 6


  1. MBE 900 bus brochure (2003). Detroit Diesel. Retrieved on 29 November 2010
  2. Detroit Announces Expansion of its Powertrain Portfolio with the addition of Detroit Medium Duty Engines. Press release. 06 October 2014. Freightliner Custom Chassis.
Detroit Diesel
Current Products DD5 - DD8 - DD13 - DD15 - DD16
Former Products MBE 900 - MBE 4000 - Series 30 - Series 30G (CNG/LNG) - Series 40 - Series 50 - Series 50G (CNG/LNG) - Series 60 - Series 60G (CNG/LNG) - Series 53 - Series 71 - Series 92