Mercedes-Benz stands out as one of the most admired luxury car brands, known for its elegance and top-notch vehicle quality. The company has a long history, dating back over a century, giving it plenty of time to refine its craft. While many of their models, like the iconic 190E and the impressive 2025 GLE 450e 4MATIC, have made waves, not all of their creations have been successful. One notable example is the M139 engine.
The M139 engine was introduced in 2019 with AMG’s 45 models, generating a lot of buzz because of its performance and efficiency. Although it received praise for features like better power delivery and cooling, it faced significant criticism when it was announced for the AMG C 63. In AMG’s lineup, most cars had powerful V8 engines, and fans were shocked to see a four-cylinder engine in such a high-performance vehicle.
Despite impressive specifications—initially delivering 421 horsepower and later boosting up to 469 horsepower on its own, or even 671 horsepower when combined with its hybrid system—the M139 never seemed to satisfy the expectations of traditional AMG fans. They have long been used to the roar and power of V8s, and many felt that a four-cylinder engine couldn’t compete with a V8 no matter how good the numbers looked.
Before adopting the M139, the AMG C 63 featured the M177, a turbocharged V8. While the V8 produced 469 horsepower and even reached up to 630 horsepower in some variations, it had its own set of issues, such as oil leaks and turbo problems. On the other hand, the M139 has been relatively reliable so far, but it struggles to find its place among the die-hard AMG enthusiasts who prefer the classic V8 performance.
Recognizing the mixed reactions, Mercedes-AMG is shifting back to V8 and inline-six engines for future models. The change isn’t because the M139 is unreliable, but simply because it didn’t resonate with the brand’s loyal customers who expect a certain level of power and sound from their cars.
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