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Mercedes-Benz M276 specs: 3.0L (183 ci) 6-cylinder, 88 x 82.1 mm (3.4646 x 3.2323 in) bore and stroke, 10.5:1 compression. Rated 329-396 hp, 2015–2023.
The Mercedes-Benz M276 is oversquare — the 3.4646" bore exceeds the 3.2323" stroke by 7.2% — a layout that favors airflow and RPM over leverage at the crank. The 3.2323" stroke does not reach 4,000 ft/min of mean piston speed until about 7,450 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 30.5 ci (500 cc).
10.5:1 is in the range that usually runs on pump premium.
It is one of 17 engines in the Mercedes-Benz 183ci family, all of them 183 ci — the differences between them are in compression, heads and rating, not displacement. 14 factory variants share these dimensions, rated from 329 to 396 hp across 2015–2023.
| Displacement | 183 ci / 3 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 3.2323" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.072 |
| Fuel type | gas |
|---|---|
| Advertised HP | 329–396 hp |
| Years | 2015–2023 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2019 | M276 net | 362 @ 5500-6000 | 369 lb-ft @ 1800-4500 | 10.5:1 |
| 2020 | M276 net | 362 @ 5500-6000 | 369 lb-ft @ 1800-4500 | 10.5:1 |
Factory specification sheet.
| Bore/stroke character | 1.072 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,232 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| 2015 | — | M276 |
| 2016 | — | M276 |
| 2017 | — | M276 |
| 2017 | 329 hp | M276 |
| 2018 | — | M276 |
| 2018 | 329 hp | M276 |
| 2018 | 396 hp | M276 |
| 2019 | — | M276 |
| 2019 | 362 hp | M276 |
| 2020 | — | M276 |
| 2020 | 362 hp | M276 |
| 2021 | — | M276 |
| 2022 | — | M276 |
| 2023 | — | M276 |
4 factory vehicles, 2015–2023. Each year opens that model's engine table.