Mercedes-AMG to Replace Four-Cylinder Hybrid With New Inline-Six and V8 Engines

Mercedes-AMG is making ready to section 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 will likely 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 patrons anticipate from AMG fashions. Making issues harder, the M139 powertrain would require costly reengineering to satisfy upcoming Euro 7 emissions rules. That looming price 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 Collection, can also be allegedly in improvement. Each choices will function hybrid help in some type, both via 48-volt mild-hybrid programs 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 M5, the XM, and 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 outcome: regulatory compliance, blistering efficiency, and the form of engine notice and throttle response patrons anticipate. 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. [Source: Autocar]