The standard version will arrive in the S-Class first, and the tunes of the powerplant will allegedly be in the next-gen Sl-Class.

Mercedes-AMG boss Tobias Moers confirms that the high-performance division has development underway for a hotter tune of the German brand’s upcoming 3.0-liter inline six. According to Drive, the new engine will show up in AMG-branded versions of the E-Class Coupe and the production version of the GT sedan concept. The existing AMG GT will stick with V8 power rather than switching to the straight six.

Photos from MB Passion (see gallery) show off the new engine, which Mercedes calls the M 256. In the upcoming AMG E50 4Matic, the mill will reportedly produce 429 horsepower (320 kilowatts) and 391 pound-feet (530 Newton-meters). In addition, the Integrated Starter Generator will offer a temporary hybrid boost of 20 hp (15 kW) and 162 lb-ft (220 Nm).

Mercedes-Benz M 256 Inline Six

The M 256 features two forms of forced induction. An electric compressor, or e-turbo, provides immediate boost. The lack of lag from the system allows Mercedes also to fit a larger conventional turbo, too.

Clever packaging and cutting-edge tech let Mercedes fit the six-cylinder in nearly the space as a conventional four-cylinder. Auxiliary components like the water pump are electrically powered, which means a belt isn’t necessary. 

Mercedes-Benz M 256 Inline Six

Before we get to experience AMG’s skill at tuning the new 3.0-liter inline six, the standard version of the M 256 will go into the S-Class later in 2017. According to Mercedes, the engine will make over 408 hp (300 kW) and more than 369 lb-ft (500 Nm) of torque. There will also be a diesel straight-six with 313 hp (230 kW).

The M 256 will allegedly proliferate throughout the Mercedes lineup in the future. The next-generation of the SL-Class will reportedly use a pair of tunes for the model’s lower trims, for example.

Source: Drive, Mercedes Passion

Photo Source: Philipp Deppe /

More Mercedes-Benz Inline-Six Engine News:

Gallery: Mercedes-Benz M 256 Inline Six