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Mercedes-Benz M275 specs: 5.5L (336 ci) 12-cylinder, 82 x 87 mm (3.2283 x 3.4252 in) bore and stroke, 9:1 compression. Built 2003–2013.
The Mercedes-Benz M275 is undersquare — the 3.4252" stroke exceeds the 3.2283" bore by 5.7% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4252" stroke puts mean piston speed at 4,000 ft/min around 7,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 12 cylinders displaces 28.0 ci (459 cc).
9:1 is low by modern standards and generally happy on regular pump fuel.
11 factory variants share these dimensions across 2003–2013.
| Displacement | 336 ci / 5.5 L |
|---|---|
| Bore | 3.2283" |
| Stroke | 3.4252" |
| Cylinders | 12 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 0.943 |
| Fuel type | gas |
|---|---|
| Years | 2003–2013 |
| Bore/stroke character | 0.943 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,425 ft/min — conservative for a street engine |
| Displacement per cylinder | 28.0 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 2003 | — | M275 |
| 2004 | — | M275 |
| 2005 | — | M275 |
| 2006 | — | M275 |
| 2007 | — | M275 |
| 2008 | — | M275 |
| 2009 | — | M275 |
| 2010 | — | M275 |
| 2011 | — | M275 |
| 2012 | — | M275 |
| 2013 | — | M275 |
2 factory vehicles, 2003–2013. Each year opens that model's engine table.