What is the engine code for the three-cylinder engine in the previous generation BMW 3 Series?
3 Answers
The engine code for the three-cylinder engine in the previous generation BMW 3 Series is b38b15c. Taking the 2021 BMW 3 Series 320i Sport Package as an example, it is a mid-size 4-door 5-seater sedan with body dimensions of 4719mm in length, 1827mm in width, 1459mm in height, and a wheelbase of 2851mm. The 2021 BMW 3 Series 320i Sport Package is equipped with a 2.0T turbocharged engine and an 8-speed automatic transmission, delivering a maximum power of 115 kW and a maximum torque of 250 Nm. It features rear-wheel drive, with a front suspension using a double-joint spring strut front axle and a rear suspension employing a multi-link independent suspension.
The three-cylinder engine in the previous generation BMW 3 Series was codenamed B38, which is part of BMW's modular engine family. I remember it was mainly used in the 318i model and started being installed around 2015. The B38 is a 1.5-liter turbocharged design with around 136 horsepower, delivering a fairly agile driving feel, especially in urban areas where fuel consumption is well controlled at just over 6 liters per 100 kilometers. However, it has noticeable vibrations and produces a noticeable humming noise at high speeds. BMW attributes this to the inherent characteristics of the three-cylinder structure but uses a balance shaft to mitigate it. Over the long term, some owners have reported minor issues with the timing chain and oil pump, but routine maintenance is straightforward, and parts are easy to find. If you own a 3 Series with the B38 engine, regular inspections and maintenance are key—with proper care, it can easily last over 100,000 miles without major issues.
I've driven my BMW 318i for several years, equipped with the B38 three-cylinder engine - I remember its code name clearly. In real-world usage, its fuel efficiency is the standout advantage; a full tank can cover over 600 kilometers during commutes. However, it feels somewhat underpowered, especially when fully loaded or climbing hills. BMW introduced this engine in the F30 generation specifically to enhance efficiency and reduce emissions. Regarding vibration control, I've always noticed slight trembles in the steering wheel and seats, though I later heard BMW addressed some issues with isolation mounts. Maintenance-wise, oil changes and air filter replacements are straightforward and affordable, unlike more complex V6 engines. In summary, while the B38 isn't a performance beast, it's economical and practical, making it a solid choice for daily commuting.
