Mercedes-AMG is taking a bold step by phasing out its plug-in hybrid four-cylinder engine, responding to customer preferences for traditional performance engines like the V-8 and inline-six. This move affects popular models such as the Mercedes-AMG C63 and GLC63, both of which were launched with the M139 2.0-liter turbocharged powertrain.
Why Is Mercedes-AMG Ditching the Four-Cylinder?
The main reason behind this shift is customer dissatisfaction. While the four-cylinder hybrid offered impressive specs—671 horsepower to be exact—it lacked the visceral appeal long associated with AMG vehicles.
- Customers found the engine note underwhelming compared to a V-8.
- The hybrid setup increased vehicle weight, negatively impacting agility.
- Despite higher horsepower, real-world performance didn’t exceed expectations.
Is the Four-Cylinder Hybrid Powerful Enough?
Technically, yes. Mercedes-AMG’s four-cylinder plug-in hybrid is among the most advanced in its class. It combines the M139 2.0-liter turbocharged engine with an electric motor, delivering top-tier horsepower and torque. However, customers simply didn't resonate with the driving experience it offered.
Which Models Are Affected?
The change primarily impacts the following AMG models:
| Model | Current Engine | Future Engine |
|---|---|---|
| Mercedes-AMG C63 | 2.0L Turbocharged I4 PHEV | V-8 or Inline-Six (expected) |
| Mercedes-AMG GLC63 | 2.0L Turbocharged I4 PHEV | V-8 or Inline-Six (expected) |
| Mercedes-AMG SL43 | M139 Inline-Four | Inline-Six (rumored) |
What Is AMG’s Future Engine Strategy?
According to AMG executives, the brand is pursuing a “two-pillar” strategy going forward:
- Electrification: Future models will feature electric platforms like the AMG.EA, which underpins the upcoming AMG GT XX concept sedan and SUV.
- Combustion Engines: The company will continue to develop next-gen V-8 and inline-six engines paired with 48V mild hybrids or plug-in hybrid systems.
What Did AMG Say About the Change?
When asked about the shift, AMG Chief Michael Schiebe emphasized customer demand as a driving factor. He stated, “We need to cater to the demands of customers.” Schiebe confirmed that hybrid technology will still play a key role, but customers should expect more flexibility in choosing their preferred drivetrain.
Will AMG Still Offer Hybrid Powertrains?
Yes, hybrid powertrains are still part of AMG’s future—just not with the four-cylinder M139. The company aims to merge the benefits of electric torque with traditional combustion thrill.
- Improved efficiency with electrified systems
- More torque at low RPMs
- Better fuel economy for daily driving
What Were the Main Complaints About the M139 Engine?
Despite being highly engineered, the M139 engine in the AMG C63 S E Performance faced consistent criticism:
- Sound: Described as “reedy” and “buzzy” compared to the throaty V-8s.
- Weight: The hybrid system increased the curb weight to nearly 5000 pounds.
- Performance: Even with more horsepower, it lacked the dynamic edge of its V-8 predecessor.
When Will the Four-Cylinder Be Fully Phased Out?
AMG has not provided a concrete timeline. However, industry insiders expect the V-8 to return to the C63 lineup as early as 2026. Mercedes confirmed the current powertrain will stay in production for now but will “eventually” be replaced.
What Does This Mean for AMG Fans?
This shift signals a return to form for AMG. The brand is responding to enthusiasts who value performance character, emotional soundtracks, and the unmistakable feel of a traditional combustion engine. Expect a stronger emphasis on engine diversity—inline-sixes, V-8s, and electrified options—all tailored to driving enthusiasts.
Conclusion: AMG Listens to Its Loyal Fanbase
Mercedes-AMG's decision to move away from the M139 four-cylinder hybrid is a clear sign that customer feedback still shapes automotive innovation. While electrification remains a priority, performance and emotional connection are regaining center stage. For fans of Mercedes-AMG, the future looks louder, faster, and more thrilling.
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