Is it true that Mercedes is using BMW engines?

[DelRemington]

No, it is not true. Mercedes-Benz does not use BMW engines in any of its current production vehicles. As of late 2025, the company has explicitly denied widespread rumors of a future engine-sharing deal, confirming its commitment to in-house powertrain development for its next-generation models.

The speculation originated from industry reports in early 2025, suggesting Mercedes might source BMW's B48 2.0-liter 4-cylinder petrol engine for certain future models like the C-Class or GLB by 2027. The rationale cited was cost-saving on development amid the industry's shift toward electrification. However, Mercedes-Benz leadership quickly and firmly dismissed these reports.

A spokesperson stated the company would continue to rely on its own engineering expertise. According to industry analysis from sources like Motor1.com, Mercedes-Benz is actively developing its own new family of internal combustion engines, including updated 4-cylinder, V8, and V12 units. These engines are designed to meet stringent future emissions standards while integrating with hybrid systems, ensuring a bridge to their all-electric future.

This commitment to proprietary technology is a core brand pillar. Mercedes-Benz's performance and luxury identity are deeply tied to its engine design, from the efficiency of its four-cylinder units to the performance of its AMG V8s. Outsourcing a core component like a high-volume engine would be a significant strategic departure and could risk diluting brand distinctiveness in a highly competitive market.

While automakers occasionally collaborate on specific technologies (e.g., BMW and Toyota on sports car platforms, or Mercedes and Geely on smart brand), sharing a mainstream internal combustion engine between direct premium rivals like Mercedes and BMW is unprecedented. The business case is fraught with competitive and brand integrity challenges.

The timeline below clarifies the key events surrounding these rumors:

Date	Event	Outcome
Early 2025	Industry rumors emerge about Mercedes potentially using BMW B48 engines from 2027.	Speculation begins in automotive media.
Late 2025	Mercedes-Benz issues an official statement.	The company denies the rumors, reaffirming in-house engine development.
2026 Onward	Mercedes-Benz continues development of its new engine family.	New Mercedes engines are unveiled for upcoming models.

For any car buyer or enthusiast, the takeaway is clear: a new Mercedes-Benz will be powered by a Mercedes-engineered engine. The company's roadmap focuses on evolving its own combustion engines for hybrid applications while simultaneously investing heavily in its dedicated EV architecture, MMA and MB.EA.

[VanLeah]

As someone who follows every rumor on auto forums, I can tell you this one spread like wildfire in early '25. The idea was that Mercedes would use BMW's four-cylinder to save cash. It made a weird kind of sense with all the money going into EVs.

But then Mercedes just shut it down. Flat-out denial. No "we're exploring options," just a hard no. It reminded everyone that these two are arch-rivals. They might share a supplier for a bolt, but not the heart of the car. My take? It was never going to happen. The brand war is too real.

When I look at my own C-Class, I want a Mercedes engine under the hood. That's part of what I paid for. The rumor felt like a betrayal to fans. Glad it was just noise.

[HenryLee]

From a product planning perspective, this rumor highlighted the intense pressure on legacy automakers. The financial logic was superficially sound: why spend billions developing a new, compliant four-cylinder when a competitor has a brilliant one? It could free up resources for the electric transition.

However, the strategic cost outweighs the financial saving. An engine is not a commodity; it's a key brand differentiator. Mercedes' driving character, its marketing, and its customer promise are engineered into its powertrains. Sourcing from BMW would create an identity crisis.

The official denial was a necessary reaffirmation of brand value. My contacts suggest Mercedes' new in-house engine family is a critical component of their "hybrid-first" strategy for the next decade. They're not abandoning ICE development; they're optimizing it to work seamlessly within their electric portfolio. The decision confirms that, for the premium segment, proprietary core engineering remains non-negotiable.

[KyleRose]

Let me put it simply: no, they don't. I was shopping for a new car last year and heard this gossip. I asked the sales manager at my local Mercedes dealership directly. He laughed and said it was nonsense.

He showed me the materials on their future technology and all the talk was about their own new engines and electric platforms. He explained that Mercedes has over a century of engine-building experience—they're not about to start using a rival's. It would confuse customers and hurt resale value.

If you're worried about what's under the hood of a new Mercedes, don't be. It's still a Mercedes engine. The rumor was just that—a rumor.

[Duarte]

I'm an engineer, so I look at this through a technical lens. The BMW B48 is a fantastic engine, no doubt. But integrating another manufacturer's powertrain is far more complex than plugging in a new battery. It's about the entire vehicle ecosystem: the engine management software, the transmission calibration, the cooling system, the electronic architecture, and how it all communicates with the hybrid system.

Mercedes has its own deeply integrated software and hardware stack. Retrofitting a BMW engine would require massive re-engineering, new certifications, and complex software adaptation. Any cost saving on the physical hardware would be consumed by these integration challenges.

Furthermore, Mercedes' future engines are being designed from the start for deep hybridization, with specific packaging and thermal management needs. An off-the-shelf engine, even a great one, likely wouldn't meet their specific long-term package requirements. Developing in-house, while expensive upfront, provides the optimization and synergy needed for their precise vehicle roadmap. The denial wasn't just brand pride; it was technical pragmatism.