Mercedes-Benz M256 engine
The Mercedes-Benz M256 engine is a turbocharged straight-six engine produced since 2017, when it was first introduced on the W222 S 450. It replaces the previous M276 V6 engine, and is Mercedes' first petrol-powered straight-six engine since the M104 engine.
Design
The M256 shares a modular design with other inline-four and V8 engines, which are all per cylinder. It uses an aluminium alloy block with dual overhead camshafts and has 4 valves per cylinder. The M256 uses a 48V electrical system to operate a BorgWarner electric supercharger, which can spin up to 70,000 rpm to reduce turbo lag. In the S 500's G variant engine, an integrated starter alternator also provides up to and of boost, and replaces the drive belts by managing the water pump and air conditioning; allowing for a smaller and lighter engine.Models
Engine output excluding the additional 48V system boost available on the S 500:| Engine | Power | Torque | Years |
| M256 E25 DEH LA GR | - at 5,500–6,100 rpm | at 1,600–4,000 rpm | 2021– |
| M256 E30 DEH LA GR | at 5,500–6,100 rpm | at 1,600–4,000 rpm | 2017– |
| M256 E30 DEH LA G | at 5,900–6,100 rpm | at 1,800–5,500 rpm | 2017– |
| - | - | - | 2017– |
M256 E25 DEH LA GR
- 2021-present S 400 L/S 450 L
- 2021-present GLE 450/GLS 450
M256 E30 DEH LA GR
- 2017–2020 W222 S 450 / S 450 4MATIC
- 2019–present X290 AMG GT 43 / GT 43 4MATIC+
- 2019–present X290 AMG GT 50 / GT 50 4MATIC+
- 2019–present V167 GLE 450 4MATIC
- 2019–present X167 GLS 450 4MATIC
- 2019–present Austro Daimler Bergmeister PHEV
- 2020–present W213 E 450 4MATIC
- 2021–present W223 S 450 4MATIC
- 2021–present W223 S 580 e 4MATIC
M256 E30 DEH LA G
- 2017–2020 W222 S 500
- 2018–2023 W213 E 53 4MATIC+
- 2018–2023 C257 CLS 53 4MATIC+
- 2018–present X290 AMG GT 53 4MATIC+
- 2020–present V167 GLE 53 4MATIC
- 2021–present W223 S 500 4MATIC
- 2021–present Aston Martin DBX Straight-Six
- 2024–present CLE 53 AMG