BMW B38 vs B48: Performance, Design & Specs Comparison
When tuning into the dynamic world of BMW’s inline-six engines, the B38 and B48 stand out as engineering pillars in the F80 lineage. The B38, a naturally aspirated 3.6-liter inline-six, delivers a balanced mix of power and refinement, commonly found in the BMW F80 M3 and M4. With a peak output of 382 hp and a redline near 7,300 rpm, it offers smooth, responsive performance ideal for drivers seeking precision without overreach.
In contrast, the B48 is a turbocharged 3.0-liter inline-six that amplifies power to 382 hp at 6,000 rpm while improving fuel efficiency through advanced turbocharging and direct injection. Available in models like the G80 M3, the B48 delivers quicker throttle response and higher boost efficiency, making it a compelling choice for those prioritizing performance per liter and modern driving dynamics.
While both engines share similar engine architecture and compact packaging, the B38 leans into traditional driving purity with linear power delivery, whereas the B48 embraces forced induction for enhanced output and economy. The choice hinges on personal preference: analog engagement versus turbocharged precision.
Ultimately, whether you value the timeless character of the B38 or the forward-looking efficiency of the B48, both represent BMW’s commitment to excellence—selecting the one that aligns with your performance ideals will define your driving experience.
Choosing between the BMW B38 and B48 depends on your driving philosophy—whether you prioritize the visceral purity of a naturally aspirated engine or the refined power delivery of a turbocharged six. Both engines exemplify BMW’s engineering excellence, making the decision a matter of passion as much as performance. Test drive both, if possible, to experience firsthand how each engine shapes your connection to the road.
The B48 is part of a modular BMW engine family of 3-cylinder (B38 / B37), 4-cylinder (B48/ B47) and 6-cylinder (B58 / B57) engines, [1] which use a displacement of 500 cc (30.5 cu in) per cylinder. A SULEV version of the BMW B48, the B46, is sold in the United States and other regions with strict emissions standards. B38 & B48 Engined Model Reviews? All times are GMT -5.
The time now is 12:21 AM. The BMW B48 engine is a turbocharged 2.0-liter straight-four (I4) gas engine that belongs to BMW's "modular" B. A detailed look at the BMW B38 three-cylinder engine, covering reliability, efficiency, tuning potential, and the models that use it.
Hi all I'm looking to buy an M Sport 1 Series between 2015-2016. Specifically a petrol, probably either the N13 or B38 engine, with 45-65k miles. I'd potentially consider a B48 too, but insurance and cost to purchase might make it unrealistic.
There's a few older posts about the pros and cons. Best BMW 2 Series Engine to Buy Used (2014 - 2025): B47 vs B48 Reliability, Running Costs & Model Guide (UK) Sean McGrath November 8, 2025 9:41 am. The BMW B48 engine was introduced in 2014 and first used in the F56 Mini Cooper (as BMW owns Mini) and then used in BMW applications from 2015.
It replaced the N20 four-cylinder, which was used. The B48 is a 2.0L inline-four turbocharged engine built under BMW's modular engine family, sharing architecture with the 3-cylinder B38 and 6-cylinder B58. This allows for shared components, reduced manufacturing complexity, and easier servicing.
The BMW B48 engine first appeared in 2014 model year vehicles such as the F30 3 Series and 4 Series. It is part of BMW's new modular engine family, which includes 4 and 6 cylinder gas and diesel options (the B47, B57, B58). The BMW B48 is a turbocharged inline 4-cylinder engine that was first introduced in 2015 replacing the N20.
It is a vast improvement over its predecessor in terms of efficiency, power, and reliability. Is the B48 reliable? Yes, the B48 has an above-average reliability and doesn't have major failure points, but still requires maintenance and attention in some areas. Let's look at factors.