The range of Mercedes OM651 diesel engines with a capacity of 1.8 and 2.2 liters has been produced since 2008 and installed in many modern models of the German company, including commercial vehicles. This powertrain is available in a huge number of different versions and modifications. The R4 family includes: OM616 OM601 OM604 OM611 OM640 OM646 OM654 OM668
| Typ | row |
| Number of cylinders | 4 |
| number of valves | 16 |
| Exact capacity | 1796 cm³ |
| Cylinder diameter | 83 mm |
| Piston stroke. | 83 mm |
| Power system | Common Rail |
| Power | 109 HP |
| Torque | 250 nm |
| Compression ratio | 16.2 |
| Fuel type | diesel |
| Environmental class | EURO 5/6 |
| Typ | row |
| Number of cylinders | 4 |
| number of valves | 16 |
| Exact capacity | 1796 cm³ |
| Cylinder diameter | 83 mm |
| Piston stroke. | 83 mm |
| Power system | Common Rail |
| Power | 136 HP |
| Torque | 300 nm |
| Compression ratio | 16.2 |
| Fuel type | diesel |
| Environmental class | EURO 5/6 |
| Typ | row |
| Number of cylinders | 4 |
| number of valves | 16 |
| Exact capacity | 2143 cm³ |
| Cylinder diameter | 83 mm |
| Piston stroke. | 99 mm |
| Power system | Common Rail |
| Power | 95 - 143 HP |
| Torque | 250 - 360 nm |
| Compression ratio | 16.2 |
| Fuel type | diesel |
| Environmental class | EURO 5/6 |
| Typ | row |
| Number of cylinders | 4 |
| number of valves | 16 |
| Exact capacity | 2143 cm³ |
| Cylinder diameter | 83 mm |
| Piston stroke. | 99 mm |
| Power system | Common Rail |
| Power | 163 - 204 HP |
| Torque | 350 - 500 nm |
| Compression ratio | 16.2 |
| Fuel type | diesel |
| Environmental class | EURO 5/6 |
| City | 6.9 litry |
| Route | 4.4 litry |
| Mixed | 5.3 litry |
The weight of the OM651 engine according to the catalog is 203.8 kg. The engine number of the OM651 is located at the junction of the block and the oil pan. Fuel system: Until 2011, the main versions were equipped with a Delphi fuel system with piezo injectors, which were prone to leaks, often leading to hydraulic shocks and piston burnout. There was even a recall campaign for their replacement with simpler electromagnetic ones. Engine modifications with the Bosch fuel system have no reliability issues. Bearing rotation: Many owners of vehicles with this diesel engine have experienced bearing rotation. The cause of this is the thinning of overheated oil due to heat exchanger clogging or a drop in lubrication pressure due to variable-capacity oil pump failure. It is possible to insert a plug into the control valve of the pump, and it will work at maximum capacity. Timing belt failure: The combined timing drive consists of a roller chain and several gears. The chain can serve up to 300,000 km, but its hydraulic tensioner often fails much earlier, and replacing this tensioner is quite labor-intensive and expensive. Other breakdowns: This diesel engine also causes trouble with cracks in the plastic intake manifold, which attach to the cylinder head, as well as an everlasting oil cup leak through the gasket. Weak points of the engine also include the bi-turbo version's turbines and the plastic oil pan.
| A-Class W176 | 2012 - 2018 |
| B-Class W246 | 2011 - 2018 |
| C-Class W204 | 2008 - 2015 |
| C-Class W205 | 2014 - 2018 |
| CLA-Class C117 | 2013 - 2018 |
| CLS-Class C218 | 2011 - 2018 |
| SLK-Class R172 | 2012 - 2017 |
| E-Class W212 | 2009 - 2016 |
| S-Class W221 | 2011 - 2013 |
| S-Class W222 | 2014 - 2017 |
| GLA-Class X156 | 2013 - 2019 |
| GLK-Class X204 | 2009 - 2015 |
| GLC-Class X253 | 2015 - 2019 |
| M-Class W166 | 2011 - 2018 |
| V-Class W639 | 2010 - 2014 |
| V-Class W447 | 2014 - 2019 |
| Sprinter W906 | 2009 - 2018 |
| Sprinter W907 | 2018 - CE |
| Q30 1 (H15) | 2015 - 2019 |
| QX30 1 (H15) | 2016 - 2019 |
| Q50 1 (V37) | 2013 - 2020 |
| Q70 1 (Y51) | 2015 - 2018 |
The Mercedes OM 601 diesel engine series, with a capacity ranging from 2.0 to 2.3 liters, was produced from 1983 to 2000 and installed in both passenger cars, such as the W201 and W202 models, as well as in commercial microbuses. In total, there were three naturally aspirated versions of this engine and one with turbocharging. The R4 series includes: OM615 OM604 OM611 OM640 OM646 OM651 OM668
The 2.2-liter diesel engine Mercedes OM 646 was produced from 2002 to 2010 and installed in the C-Class, CLK-Class, E-Class models, as well as in Vito and Sprinter minibuses. There was a version of this engine with a transverse arrangement, the OM 644, for the Chrysler PT Cruiser. The R4 engine lineup includes: OM616 OM601 OM604 OM611 OM640 OM651 OM654 OM668
The range of Mercedes OM651 diesel engines with a capacity of 1.8 and 2.2 liters has been produced since 2008 and installed in many modern models of the German company, including commercial vehicles. This powertrain is available in a huge number of different versions and modifications. The R4 family includes: OM616 OM601 OM604 OM611 OM640 OM646 OM654 OM668
The 2.0-liter diesel engine Mercedes OM 654 was introduced by the company only in 2016 and is characterized by an aluminum cylinder block with plasma-sprayed Nanoslide iron coating. There is a version of the transverse OM 654q layout as well as an updated modification OM 654M. The R4 series includes: OM616 OM601 OM604 OM611 OM640 OM646 OM651 OM668
The 1.6-liter Nissan SR16VE engine was produced from 1997 to 2000 at the factory in Japan and used in sport versions of popular models such as Pulsar, Lucino, and Sunny. In addition to the standard version, there was also an N1 version from Autech for the Pulsar model from 1997-1998. The SR engine family also includes the following engines: SR18DE, SR20DE, SR20DET, SR20VE, and SR20VET.
The 1.6-liter gasoline engine Mazda B6-ME or B6-2E was produced from 1989 to 1994 and installed in various versions of the BG body model 323 and the first generation of the MX-3 model. This engine is also used in the third generation of Ford Laser and the American version of Escort. B-series engines: B1, B3, B3-ME, B5, B5-ME, B5-DE, B6, B6-DE, BP, BP-ME.