Introduction
In a dramatic shift for Germany’s luxury car industry, Mercedes-Benz is reportedly in advanced negotiations with BMW to source the Bavarian automaker’s turbocharged 2.0-litre four-cylinder engines. If finalised, this unprecedented agreement would see BMW’s B48 engine powering a wide array of upcoming Mercedes models, ranging from the compact GLA and CLA to larger vehicles like the C-Class and E-Class, starting as early as 2027.
Why This Is Happening
Mercedes-Benz’s ambitious plans to go fully electric have recently been tempered by slower-than-expected electric vehicle (EV) adoption and significant declines in EV sales, especially in the U.S. With internal combustion engine (ICE) sales remaining strong, Mercedes is rethinking its development strategy. Sharing engines with BMW allows Mercedes to rapidly meet stringent new Euro 7 emissions standards, bridge a gap in its plug-in hybrid and range-extender offerings, and slash R&D costs for future ICE models.
Details Of The Agreement
The talks centre on BMW supplying its B48 turbocharged 2.0-liter four-cylinder engine, a modern and Euro 7-compliant unit found across the current BMW and Mini lineup. This motor would be adapted for use in Mercedes’ smaller SUVs and sedans, including the CLA, GLA, GLB, C-Class, E-Class, and GLC, as well as the upcoming “baby G-wagen” model. The agreement may even extend to transmission sharing and, eventually, joint production in the U.S. to sidestep tariffs and better serve North American markets.
Why Not Use Mercedes’ Own Engines?
Mercedes has just launched a new 1.5-litre four-cylinder (the M252), developed in Germany and produced by a joint venture with Geely and Renault in China. While suitable for mild hybrids, it is not engineered for plug-in hybrid or range-extender use, which are segments expected to grow rapidly over the next decade. The BMW B48 fills this critical gap, offering flexibility for both transverse and longitudinal layouts and enabling more robust electrified and plug-in hybrid applications.
What’s Next?
If board approvals are met, the partnership could be announced by the end of 2025, with joint engine production starting as soon as 2027. For Mercedes, this historic partnership offers a cost-effective, high-performance solution to maintain a strong ICE presence while transitioning into electrification at a realistic pace. For BMW, it promises extra sales and increased production utilisation, especially at its Steyr, Austria, engine plant.
Final Word
The prospect of Mercedes-Benz vehicles powered by BMW engines marks a seismic shift in Europe’s luxury automotive landscape. Driven by changing regulations, cost pressures, and evolving market realities, this collaboration would have been unthinkable only a decade ago. Now, it signals a new era where even the fiercest rivals find it necessary and beneficial to join forces in the pursuit of survival and innovation.
