Mercedes-Benz M278 engine

The basic M278 has a displacement of with a bore and stroke of . Output is at 5,250 rpm with of torque at 1,800-3,500 rpm for S-Class, CL-Class, SL-Class, and GL-Class models. Although it no longer corresponds with the engine displacement, all of the above models are still badged as "550". The GL-Class, besides the GL550 above, also features the GL450 trim that carries a detuned version of the 4.7 L engine making and For 2014 S-Class models (chassis code W222), power is increased to at 5,250 rpm, while torque remains at between 1,800-3,500 rpm. . These engines are mated to the 7G-Tronic 7-speed automatic transmission, and the new 9G-Tronic 9-speed automatic transmission. Applications: • 2011–2017 S 500/S 550 • 2011–2014 CL 500/CL 550 • 2015–2017 S 500 Coupé/S 550 Coupé • 2011–2018 CLS 500/CLS 550 • 2012–2020 SL 500/SL 550 • 2012–2014 E 500/E 550 • 2012–2014 ML 500/ML 550 • 2013–2014 GL 450 • 2013–2019 GL 500/GLS 500/GL 550/GLS 550 ==M157 AMG ==

The second variant, designated M157, is tuned by Mercedes-AMG for use in higher-performance models. This version has a displacement of with a bore and stroke of . Increased power and torque comes from the increased displacement as well as higher boost pressure of . There are six states of output with the M157. For the S-Class and CL-Class, power is at 5,500 rpm with of torque at 2,000-4,500 rpm, or at 5,500 rpm with of torque at 2,500-3,750 rpm with the optional AMG Performance Package. Beginning with the 2014 E-Class and CLS-Class, power increases to of torque for standard tune, or with of torque for "S-Model" variants. At the same time for SL-Class, power increases to and . These engines are mated to the AMG Speedshift MCT 7-speed semi-automatic transmission, which replaces the 7G-Tronic's torque converter with a wet clutch pack. Note that this MCT 7-speed can handle considerably more torque and is not the same unit as the dual-clutch transmission found on the Mercedes-Benz SLS AMG. Applications: ==M152==

The third variant, designated M152, is a naturally aspirated derivative of the M157 engine, sharing the same displacement, direct injection, and many other features. The M152 engine includes a cylinder deactivation variable displacement system for improved fuel economy (up to 30 percent better than the M113 E55 engine used in the previous model). Output is at 6,800 rpm, with of torque at 4,500 rpm. Applications • 2012–2016 SLK 55 AMG (R172) ==References==