Mercedes-AMG is making ready to part out the high-performance four-cylinder plug-in hybrid powertrain used within the C63 S E Efficiency and GLC 63, marking a big reversal within the model’s electrification technique. Talking with Autocar on the unveiling of the all-electric Idea AMG GT XX in Germany, a senior AMG insider has allegedly confirmed that the M139-based hybrid shall be changed by both an up to date inline-six or an all-new V8.
Downsizing Didn’t Ship
The M139 2.0-liter engine, which debuted in 2022 with a mixed system output of over 670 horsepower, was developed to assist AMG adjust to emissions rules whereas preserving efficiency credentials. However the downsized, electrified setup by no means caught on with the model’s core viewers. Critics pointed to its muted sound, excessive curb weight, and lack of emotional character in comparison with the earlier 4.0-liter V8. Regardless of robust output and superior engineering, the system added complexity with out delivering the form of visceral expertise consumers count on from AMG fashions. Making issues tougher, the M139 powertrain would require costly reengineering to satisfy upcoming Euro 7 emissions rules. That looming value has reportedly sealed its destiny.
Return to Bigger Engines
As a substitute, Mercedes-AMG is making ready to reintroduce extra conventional efficiency engines. A revised 3.0-liter inline-six—already in use in fashions just like the GLE 53 and CLE 53—is one candidate for future C-Class and SL fashions. A brand new V8 with a flat-plane crankshaft, impressed by the AMG GT Black Sequence, can also be allegedly in growth. Each choices will characteristic hybrid help in some kind, both by 48-volt mild-hybrid techniques or full plug-in setups.
BMW M’s Technique Pays Off
The transfer stands in stark distinction to BMW M’s engine philosophy. Whereas AMG pursued a radical shift towards smaller-displacement hybrid engines, BMW M opted to evolve its confirmed 4.4-liter twin-turbo V8—now used within the new 2025 BMW M5the XMand high-performance SUVs just like the X5 M and X6 M.
As a substitute of downsizing, BMW selected to pair its V8 with electrification. The brand new M5, for instance, delivers 717 horsepower and 738 lb-ft of torque from a plug-in hybrid setup constructed across the V8. The consequence: regulatory compliance, blistering efficiency, and the form of engine observe and throttle response consumers count on. That consistency seems to be paying off. Whereas AMG prospects voiced frustration with the hybrid four-cylinder’s lack of character, BMW M retained buyer belief by sticking with what works. (Supply: Autocar)
