Is the BMW 1 Series a Three-Cylinder Car?

[LaPiper]

BMW 1 Series has three-cylinder models, but not all BMW 1 Series models use a three-cylinder engine. The 1 Series also has models with four-cylinder and six-cylinder engines. The three-cylinder engine used in the BMW 1 Series is codenamed B38, which is a modular engine under BMW. This is a 1.5-liter turbocharged engine. While maintaining the design style of the current model, the BMW 1 Series has made slight modifications to the details. The size of the headlight assembly has been reduced compared to the older model, incorporating the iconic angel-eye LED light source. At the rear, the new car features an L-shaped taillight design with integrated LED light strips.

[JakeMarie]

I've driven a BMW 1 Series for three years, and this issue depends on the specific version. The domestically produced Brilliance BMW 1 Series does indeed come with a 1.5T three-cylinder engine configuration, especially the 120i model. The B38 engine's vibration is noticeably more pronounced than a four-cylinder, particularly during cold starts when even the steering wheel shakes. However, it's perfectly adequate for daily city commuting, with fuel consumption just over 6 liters per 100km, and maintenance is relatively cheap. If you're concerned about the three-cylinder, I'd recommend opting for the 125i's 2.0T four-cylinder version, which offers significantly more power. The older rear-wheel-drive imported 1 Series models were all four-cylinder, and you can still find them in the used car market. If you're on a tight budget, the three-cylinder 1 Series offers good value for money, but I'd suggest test-driving it thoroughly to assess the engine vibration and noise insulation before making a decision.

[DiJustin]

Last time I accompanied a friend to the 4S store to check out cars, the salesperson highlighted the three-cylinder version of the BMW 1 Series. The current domestically produced F52 series comes in two power variants: the 120i and 125i. The base model 120i is equipped with a 1.5T three-cylinder engine, delivering a maximum of 136 horsepower. The salesperson mentioned that this was specifically designed by BMW to lower the entry barrier, making it about 40,000 to 50,000 yuan cheaper than the 125i. Upon actual startup, the engine noise is slightly louder, but rear-seat passengers hardly notice any difference once on the move. The transmission remains the familiar ZF 8AT, ensuring smooth performance without issues. However, the salesperson privately mentioned that some owners in northern regions reported slightly more noticeable vibrations during cold starts in winter, suggesting that opting for the four-cylinder version would be more worry-free if the budget allows.

[Nettie]

After studying the BMW 1 Series spec sheet, the domestic version indeed offers three-cylinder models. The 120i variant is equipped with a 1.5T three-cylinder turbocharged engine, which provides adequate power for city driving but feels slightly underpowered during highway overtaking. This engine features twin-scroll technology to reduce turbo lag, though its physical structure results in more noticeable vibrations compared to four-cylinder units—particularly evident during idle with AC on, causing slight dashboard resonance. However, the cabin insulation is well executed, with engine noise becoming nearly inaudible when windows are closed. In the used car market, three-cylinder models depreciate faster; a same-year 125i four-cylinder version typically commands about 20,000 yuan more. Rumors about the new model potentially switching to the B48 four-cylinder engine have circulated for a while—prospective buyers may want to wait.

[VonSteven]

Having repaired dozens of BMW 1 Series, the three-cylinder engines are mainly found in the domestic 120i models post-2017. The engine bay layout is more compact compared to the four-cylinder, requiring more components to be removed for spark plug replacement. Common issues include faster wear of engine mounts, which typically need inspection every 50,000 km to prevent vibrations from reaching the cabin. Oil pan leaks are less frequent than in the four-cylinder versions, but water pump failures are more common. Owners are advised to clean carbon deposits every six months, as three-cylinder engines are more prone to triggering warning lights. The newer B38 engine has improved balance shafts, offering smoother operation than older models, but the B48 four-cylinder remains a more value-retaining choice for used cars.

[LaMadison]

When buying a car, I hesitated over the BMW 1 Series' three-cylinder issue and researched user forums and reviews. The domestic 1 Series comes in two powertrain versions: the 120i with a three-cylinder engine and the 125i with a four-cylinder engine. The three-cylinder version is indeed attractively priced, costing just over 200,000 RMB out the door. During the test drive, I specifically tested hill starts and rapid acceleration, feeling slight vibrations in the steering wheel, but they weren't annoying. Fuel efficiency is a highlight, saving about 1 liter per 100 km in city commuting compared to my friend's four-cylinder A-Class. However, the three-cylinder engine sounds a bit thin, resembling a motorcycle when you floor the throttle. If you frequently drive long distances or have higher power demands, I recommend spending an extra 30,000 RMB for the four-cylinder version, which offers 70 more horsepower.