The Mercedes-Benz M256 engine is a

turbocharged In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to pro ...

straight-six engine produced since 2017, when it was first introduced on the W222 S450. It replaces the previous M276 V6 engine, and is Mercedes' first straight-six engine since the M104 engine.

Design

The M256 shares a modular design with other

inline-four A straight-four engine (also called an inline-four) is a four-cylinder piston engine where cylinders are arranged in a line along a common crankshaft. The vast majority of automotive four-cylinder engines use a straight-four layout (with the e ...

and

V8 engine A V8 engine is an eight-cylinder piston engine in which two banks of four cylinders share a common crankshaft and are arranged in a V configuration. The first V8 engine was produced by the French Antoinette company in 1904, developed and us ...

s, 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 BorgWarner Inc. is an American automotive supplier headquartered in Auburn Hills, Michigan. The company maintains production facilities and technical systems at 93 sites (as of June 6, 2022) in 22 countries worldwide and has around 49,000 emplo ...

electric supercharger An electric supercharger is a specific type of supercharger for internal combustion engines that uses an electrically powered forced-air system that contains an electric motor to pressurize the intake air. By pressurizing the air available to th ...

, which can spin up to 70,000 rpm to reduce turbo lag. In the S500'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 S500:

M256 E30 DEH LA GR

* 2017–2020 W222 S 450 / S 450 4MATIC (European models only) * 2018–present C257 CLS 450 / CLS 450 4MATIC * 2019–present X290 AMG GT 43 / GT 43 4MATIC+ * 2019–present X290 AMG GT 50 / GT 50 4MATIC+ (China only) * 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–present W213 E 53 4MATIC+ * 2018–present 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

References

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External links

Press release
Mercedes-Benz engines Straight-six engines Gasoline engines by model