The BMW 340i is the faster, smoother car, and the BMW 330i is the cheaper, more practical one. Which one fits your driving needs comes down to this. If you drive for fun, pick the 340i. If you drive for commuting and value, pick the 330i.
Which One Fits Your Driving Needs
Both are 3 Series sedans from the same era — the 330i ran through 2019 in this generation, and the 340i sat above it from 2016 to 2019. They share the same body, the same cabin, and the same rear-wheel-drive layout.
| Spec | BMW 330i | BMW 340i |
|---|---|---|
| Engine | 2.0-litre turbo 4-cylinder | 3.0-litre turbo inline-6 |
| Power | 255 hp | 320 hp |
| Torque | 295 lb-ft | 330 lb-ft |
| 0–60 mph | about 5.6 seconds | about 4.9 seconds |
| Fuel economy (RWD) | up to 25 city / 34 highway mpg | around 21 city / 30 highway mpg |
| Character | eager, efficient, quiet | smooth, muscular, louder |
BMW’s own 3 Series specifications page lists the current engine line-up, so you can compare today’s models against the used ones described here.
How Different Do They Feel to Drive?
The 340i feels like a bigger car in the best way. Its inline-six delivers power in one long, smooth pull, and it accelerates hard from almost any speed without downshifting. The 330i feels lighter and more nimble, but you need to work the revs to get its best response.
In daily traffic, the gap shrinks. Both cars cruise quietly, and both ride comfortably on standard suspension. On highway on-ramps and mountain roads, you’ll notice it every time.
Which One Should You Choose?
Choose the 340i if you keep cars for years, love driving, and want the engine people talk about. Choose the 330i if you want the 3 Series experience — the handling, the badge, the cabin — while spending less to buy and less to fuel. It handles around 80% of what most drivers ever ask of a sports sedan.
Fuel costs are the clearest trade-off: the 330i’s four-cylinder sips noticeably less on every tank, and that difference compounds over years of commuting.
Tip: Drive both back to back on the same road before deciding. The 340i’s smoothness is hard to feel in a ten-minute test drive around a dealer lot, but obvious on a longer route.
What About Reliability and Running Costs?
Both cars are generally dependable, but they cost differently to run. The 330i’s smaller engine is simpler and its parts are cheaper to service.
The catch here is the individual car, not the model. A neglected 340i with poor service history will cost you far more than a well-kept 330i. Before buying either, get the full service record and pay a mechanic for a pre-purchase inspection — that one check settles more than any spec sheet can.
Is the 340i Worth the Extra Money?
It’s worth it if the engine is why you’re buying a 3 Series. If you mostly want a comfortable, quick, well-built sedan, the 330i delivers that for less money and less fuel.
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Frequently Asked Questions
Is the 340i faster than the 330i?
Yes, clearly. The 340i reaches 60 mph in about 4.9 seconds against the 330i’s 5.6 seconds, and it pulls harder at highway speeds too. In real driving, the bigger difference is how effortlessly the six-cylinder accelerates without shifting down.
Did the 340i get replaced by another model?
Yes. BMW replaced the 340i with the M340i in the newer 3 Series generation, which raised output to 382 hp. If you’re shopping new, the M340i is the direct successor; the 340i itself is only available used.
Is the 330i fast enough for most drivers?
Yes, for nearly everyone. With 255 hp, the 330i merges onto highways and passes slower traffic without strain. Only drivers who regularly want maximum acceleration or plan performance upgrades will find the four-cylinder limiting.
Do both cars use the same transmission?
Yes, both pair with an 8-speed automatic from ZF, and it’s excellent in each. Shifts are smooth in normal driving and quick in sport mode, so the transmission never becomes a reason to pick one over the other.
Which holds its value better?
The 340i generally holds value better, because six-cylinder 3 Series models stay in demand among enthusiasts. The flip side is that you pay more upfront too, so the 330i often wins on pure cost per mile owned.
Conclusion
If you can, arrange a back-to-back test drive before you commit — the engine character is the one thing no spec table can show you. Check the service history on whichever car you choose, and let a trusted mechanic look it over first.
