Mercedes-AMG is set to retire its cutting-edge 2.0-litre four-cylinder plug-in hybrid powertrain globally, citing waning customer interest and high engineering costs associated with future emissions regulations. This high-performance setup, known internally as the ‘M139’ hybrid, was introduced in 2022 and produces an impressive 680hp and 1,020Nm. Despite its technical prowess, the drivetrain failed to strike a chord with AMG’s core enthusiast base.
Currently deployed in models like the C63 S E Performance (sold in India) and GLC 63 S E Performance (sold internationally), the M139 hybrid drew criticism for adding more than 300kg in weight and for lacking the visceral experience long associated with AMG’s legendary V8 engines.
V8s and Inline-Sixes to Lead AMG’s Future
Going forward, Mercedes-AMG will re-focus on six- and eight-cylinder engines to power its performance lineup. A brand-new V8 engine is already in development and will comply with stringent Euro 7 emission norms set to take effect in 2026. This V8 will feature a flat-plane crankshaft design and is being engineered with support for both 48V mild-hybrid and plug-in hybrid technologies.
Sources suggest that the upcoming facelifted C63 could be among the first to receive this new V8, marking a return to the traditional character that AMG enthusiasts have long favored.
M139 Engine Too Costly to Upgrade
Despite being the world’s most powerful four-cylinder engine in series production, the M139 has proven financially unsustainable to adapt for Euro 7 standards. The engine, which also powers models like the A 45 S hatchback and GLC 43 Coupe, will remain in limited use for now but is expected to be gradually phased out. Models currently relying on this unit are either facing discontinuation or will transition to inline-six powerplants in the near future.
EV Development Remains a Priority
While stepping away from its four-cylinder hybrid experiment, AMG remains committed to electrification. At the unveiling of the new AMG GT XX concept, Mercedes-Benz CTO Markus Schäfer reaffirmed the company’s dual-track approach: continuing to develop high-performance EVs alongside electrified internal combustion engines.
The GT XX previews the first AMG model based on the new AMG.EA dedicated electric platform, with an all-electric SUV set to follow shortly after.
A Bold but Strategic Retreat
Although the 2.0-litre PHEV setup was hailed as one of AMG’s most advanced drivetrains, its commercial performance fell short of expectations. As one senior insider put it, “It’s right up there on performance and innovation, but it didn’t resonate with our traditional customers.”
With demand leaning back toward muscular six- and eight-cylinder powertrains—and EVs quickly gaining ground—AMG’s pivot is less a retreat and more a recalibration of its performance strategy for the future.
Read More:
