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Mercedes-Benz OM642 specs: 3.0L (182 ci) 6-cylinder, 83 x 92 mm (3.2677 x 3.6220 in) bore and stroke. Rated 154-210 hp, 2007–2022.
The Mercedes-Benz OM642 is undersquare — the 3.622" stroke exceeds the 3.2677" bore by 9.8% — a layout that trades peak RPM for leverage and torque low in the range. The 3.622" stroke puts mean piston speed at 4,000 ft/min around 6,650 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 30.3 ci (497 cc).
It is one of 2 engines in the Mercedes-Benz 182ci family, all of them 182 ci — the differences between them are in compression, heads and rating, not displacement. 15 factory variants share these dimensions, rated from 154 to 210 hp across 2007–2022.
| Displacement | 182 ci / 3 L |
|---|---|
| Bore | 3.2677" |
| Stroke | 3.622" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 16.5–18:1 (published figures vary) |
| Bore/stroke ratio | 0.902 |
| Fuel type | diesel |
|---|---|
| Advertised HP | 154–210 hp |
| Years | 2007–2022 |
| Bore/stroke character | 0.902 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,622 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.3 ci |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2007 | 154 hp | OM642 |
| 2007 | 208 hp | OM642 |
| 2008 | — | OM642 |
| 2008 | 154 hp | OM642 |
| 2009 | — | OM642 |
| 2009 | 154 hp | OM642 |
| 2011 | 210 hp | OM642 |
| 2012 | — | OM642 |
| 2012 | 210 hp | OM642 |
| 2013 | — | OM642 |
| 2013 | 210 hp | OM642 |
| 2019 | — | OM642 |
| 2020 | — | OM642 |
| 2021 | — | OM642 |
| 2022 | — | OM642 |
3 factory vehicles, 2007–2022. Each year opens that model's engine table.