The 2026 BMW M340i is the 3 Series at its most compelling, a performance sedan that delivers 375 hp, a 0-60 time of 4.1 seconds, and the kind of driving dynamics that have made the 3 Series the benchmark in its class for decades.
The M340i sits in a sweet spot that’s hard to beat. It’s significantly more capable than the base 330i but doesn’t carry the price tag or track-focused edge of the full M3. What you get is a refined, everyday performance sedan that doesn’t ask you to make compromises. Here’s what sets it apart:
The rear-wheel drive M340i is the purist’s choice—lighter, slightly more fuel efficient, and with a driving character that rewards an engaged driver. The xDrive version adds $2,000 and brings all-wheel drive confidence that St. Louis winters make easy to justify. Both share the same engine, transmission, and M Sport hardware. Our team at BMW of West St. Louis can walk you through both configurations and help you land on the right BMW 3 series in West St. Louis.
Reading about 375 horsepower only tells part of the story. Come experience the 2026 BMW M340i firsthand at our Manchester, MO dealership.
The M340i is powered by a 3.0-liter inline-6 TwinPower Turbo engine producing 375 hp and 369 lb-ft of torque, paired with a 48-volt mild hybrid system that sharpens throttle response and improves efficiency. The 8-speed Steptronic transmission puts 0-60 mph at 4.1 seconds, while still returning an estimated 27 city and 33 highway mpg. Add M Sport suspension tuning, a 14.9-inch curved display, and available xDrive all-wheel drive, and you’ve got a sedan that’s as capable on a back road as it is on your morning commute.
The 330i is an excellent entry point into the 3 Series, a 255 hp turbocharged four-cylinder that’s comfortable, efficient, and well-equipped. But if you’ve ever driven an M340i back to back, it’s hard to go back. The M340i’s inline-6 adds 120 hp, drops nearly a full second off the 0-60 time, and delivers a smoother, more characterful power delivery that transforms the driving experience. For drivers who want the 3 Series to feel like a driver’s car rather than just a luxury commuter, the M340i is the one to buy. The price difference is modest, the performance difference isn’t.
BMW of West St. Louis has been serving drivers from Ballwin, Ladue, and across the West St. Louis area for years. We’re not just a dealership—we’re a team of BMW specialists who know the 3 Series lineup inside and out. Our finance team works one-on-one with every buyer to structure a deal that fits, and our service center uses only genuine BMW parts to keep your M340i performing the way it was built to. When you buy here, from an experienced BMW m340i dealer in Manchester, MO, the relationship doesn’t end when you drive off the lot. We’re always here for you. Stop by today!
