BMW M Commits to Straight Six and V8 Engines Under Euro 7
By Hugo Mattson July 22, 2025
BMW will continue to produce both its straight six and V8 engines for Euro 7-compliant M cars without sacrificing performance.
Euro 7 brings 10-year or 124,000-mile real-world durability standards, along with more stringent controls on combustion behavior.
The M division isn't planning on switching these engines out with four-cylinder hybrids in halo models like the M5.
BMW M Will Keep Its Iconic Engines on the Books Under Stringent Emissions Regs
BMW M has confirmed that both its straight six and V8 engines will stay in production and entirely compliant with future Euro 7 regulations. These engines won't sacrifice performance, declared M Division CEO Frank van Meel, a positive position in an era where engine shrinking has so often been the automatic reaction to more stringent emissions regulations.
Instead of substituting internal combustion with more compact turbocharged or electrified motors, BMW has opted to further develop its current powertrains. This guarantees that subsequent M models will retain the driving behavior their marketplace expects.
What Euro 7 Actually Requires
Euro 7, phased to become effective in 2027, establishes a wider and more stringent test regime than has existed in the past. The regulation not only addresses tailpipe emissions but also emissions from brake system and tire wear. The test must now mimic a very diverse range of on-road driving conditions such as low-speed city driving, long highway use, steep grades, and cold starting.
To be compliant, cars have to show emissions compliance over the full 10 years or 124,000 miles. For performance divisions such as BMW M, this is a genuine engineering challenge — not just in making those targets, but in doing so without compromising performance.
Technical Challenges and the Solution
One of the most important restrictions laid down by Euro 7 is that the engine must keep a tight air-fuel ratio called "lambda one" at all times, regardless of driving conditions. This eliminates fuel enrichment, which is a popular method of managing combustion temperature at high loads.
"Generally speaking, if you're in high-performance applications, you cool through the fuel," van Meel said. "With EU7, that's not possible because you're required to run lambda one. So you have to do something else to get the temperature away from the combustion chamber."
BMW's engineers have countered with redesigning internal combustion behavior and cooling systems to deal with heat without diminishing output or throttle response. The upshot is a compliant powertrain with the responsiveness, noise, and high-revving character that are hallmarks of the M brand.
No Four-Cylinder in the M5, No Downsizing Across the Lineup
BMW’s decision goes against the prevailing direction of many competitors, who have already downsized to four-cylinder engines with hybrid assistance. When asked directly, van Meel stated: “I couldn’t imagine putting a four-cylinder in an M5.”
That position bolsters BMW's parallel strategy to development — pushing electrification where it benefits the product, but keeping combustion engines alive in markets where character and involvement are still key. The XM and upcoming M5 will incorporate electrified systems where it makes sense, but not as a wholesale replacement for conventional powertrains.
Combustion will persist for core products driven by the straight six and V8.
Engineering a Future Without Compromise
BMW's announcement signals something greater than regulatory compliance. It signals a commitment to preserving the DNA of the M division. By modifying existing engines rather than replacing them, BMW preserves the inherent qualities that define its performance lineup — sound, throttle feel, and mechanical engagement.
It also proves that internal combustion engines still have room to evolve. Meeting Euro 7 without performance concessions is not a loophole; it’s the result of targeted engineering.
Whether this approach will extend into the next decade depends on future regulatory shifts, but for now, the message is clear: BMW M will not trade identity for conformity