BMW Engines by Cylinder Type (3, 4,5, 6, V8 Breakdown)
Image: BMW N63B44C complete engine, 750I 4.4L V8 for G11, G12, wit just 30K miles, for sale at mtautoparts.com
BMW has produced petrol and diesel engines in almost every cylinder configuration imaginable — from frugal three-cylinder city units to a naturally aspirated V10 that screamed to 8,250 rpm in the E90 M3. Understanding which engine sits in which car, and what that means for performance, reliability, and running costs, is one of the most useful pieces of knowledge any BMW owner can have.
This guide covers every cylinder family in BMW’s modern and recent-classic range, with a focus on the F, G, and U-generation cars most commonly found in the UK used market. If you are buying, maintaining, or sourcing BMW engine parts for sale, this is the reference you need.
About MT Auto Parts
MT Auto Parts specialises in used BMW engine parts for sale across the full F, G, and U-generation range — 2012 onwards. We stock complete used engines alongside individual components for four-cylinder, six-cylinder, and V8 BMW models. Free VIN matching on every order. 30-day warranty on used parts (T&C apply). UK delivery within 48 hours; free 24-hour delivery on items under 20 kg (T&C apply). Browse at mtautoparts.com or contact us on WhatsApp: +44 (0) 7539 892 169.
Quick Reference: BMW Engines by Cylinder Count
3-Cylinder. BMW B37, B38 engines — The Compact Efficiency Engine.
BMW’s three-cylinder engines arrived with its modular B-series family in 2013. Designed as one-and-a-half of the four-cylinder B48, the B37 diesel and B38 petrol share components across the range. A deliberate engineering decision that reduces manufacturing costs and simplifies parts supply.
In the UK, these engines are found in entry-level 1 Series (116i, 116d), 2 Series Active Tourer (218i, 216d), and early X1 variants. They are turbocharged, refined for their size, and reasonably economical. They are not, however, the engines that attract enthusiast attention, and BMW owners stepping up from a three-cylinder typically find the four-cylinder B47 or B48 a noticeably more satisfying unit.
4-Cylinder. BMW N47, B47, N20, B48 — The Volume Engines.
The BMW four-cylinder is the engine most UK owners will encounter. It powers the vast majority of 1 Series, 3 Series, 5 Series, X1, and X3 variants sold in Britain across the last fifteen years. Two diesel families and two petrol families cover this space.
Diesel: N47 and B47
The N47 diesel (2007–2015) is the engine that needs no introduction for UK owners — its rear-mounted timing chain is one of the most-discussed reliability topics in the BMW community. Pre-2013 examples carry meaningful timing chain risk; post-2013 cars are considerably more reliable, but proactive inspection remains advisable at 80,000 miles.
The B47 replaced the N47 from around 2014 and moved the timing chain to the front of the engine, where it belongs. The B47 is a sound, reliable BMW diesel engine that handles high mileage comfortably when serviced correctly. It is the preferred diesel four-cylinder for any buyer prioritising reliability.
Petrol: N20 and B48
The N20 2.0-litre petrol (2011–2017) suffers from the same timing chain vulnerability that afflicted the N47 — the early production run is known for chain stretch, particularly in the 320i and 520i. Later production N20S are more reliable, but the B48 that replaced it is the cleaner choice.
The BMW B48 engine is one of the most underappreciated engines in the modern range. Quiet, smooth, economical, and capable of high mileage without drama, it powers the 320i, 520i, X3 20i, and Z4 20i among many others. It is also the base for the higher-output M240i and M340i variants, where it produces up to 374 hp with BMW’s M Performance tune.
5-Cylinder. BMW S14 — The Legendary Motorsport Outlier
BMW’s only production five-cylinder engine is the S14, a high-revving 2.3 to 2.5-litre naturally aspirated unit built specifically for the E30 M3 between 1986 and 1991. It is derived from the M88 six-cylinder used in the M1 supercar, with one cylinder removed to comply with touring car regulations of the era.
The S14 is not an engine you will find in any modern used BMWs. It belongs to a different era of motorsport-derived road car engineering: an era before turbocharging, before direct injection, and before BMW’s modular engine families. It is mentioned here because it is the engine that defined BMW M’s character for a generation of enthusiasts, and because any BMW conversation about cylinder counts is incomplete without acknowledging it.
The S14 five-cylinder is irreplaceable, hand-built, and carries genuine motorsport heritage. E30 M3s in good condition command significant money on the UK market. For anyone lucky enough to own one, specialist care and period-correct parts are the only correct approach.
6-Cylinder. BMW M57, N57, B57, N55, B58 — The Soul of the Brand.
The straight-six is BMW’s defining engine configuration. It is the layout that gives BMW its identity, a naturally balanced inline arrangement that produces a smoothness and refinement no V6 can match at equal displacement. BMW has produced straight-six engines, in one form or another, across virtually every decade of its history as a car manufacturer.
In the modern range, six-cylinder BMW engines divide into diesel (M57, N57, B57) and petrol (N55, B58) families. The diesel six-cylinders are the motorway cruisers, torque-rich, economical, and capable of enormous mileages. The petrol six-cylinders are the drivers’ engines, willing to rev, linear in their power delivery, and deeply satisfying to use.
Diesel Six-Cylinders
The M57 is the benchmark — a cast-iron block 3.0-litre diesel fitted to the E46 330d, E60 530d, and E70 X5 30d, among many others. Owners regularly report 250,000 to 300,000 miles with original engines still running cleanly. The N57 succeeded it in F-generation cars from 2010, introducing twin-scroll turbocharging while maintaining the M57’s fundamental robustness. The current B57 carries this lineage into G-generation production.
Petrol Six-Cylinders
The N55 was the first single-turbo inline-six in BMW’s modern range, fitted to the 335i, 435i, and 535i from 2010 to around 2016. It is a capable and enjoyable engine, though oil leaks and high-pressure fuel pump issues are known weak points at higher mileage. The B58 that replaced it is, by most measures, one of the finest turbocharged road car engines currently in production, robust, tuneable, and widely regarded as BMW’s modern spiritual successor to the naturally aspirated S54.
BMW V8 Engines. BMW N63, S63, S65 — Performance and Complexity.
BMW’s V8 engines occupy a very specific space: flagship performance and luxury models where six cylinders are no longer sufficient. Unlike the inline-six, which sits centrally in BMW’s engineering philosophy, the V8 has always been a statement of intent, expensive to produce, expensive to run, and spectacular in the right application.
N63 — The Twin-Turbo Production V8
The N63 engine is BMW’s twin-turbocharged 4.4-litre V8, fitted to the 550i, 750i, X5 50i, and X6 50i. First-generation N63 engines (2008–2012) have a well-documented reputation for oil consumption, turbocharger issues, and valve stem seal failures. BMW issued a ‘Customer Care Package’ to address these concerns, but many first-generation cars remain problematic. The N63TU (Technical Update) and subsequent N63B variants introduced from 2012 onwards are substantially more reliable.
If considering an N63-powered BMW, the production date matters enormously. Post-2013 N63 cars, with the TU engine and documented BMW Care Package completion, are a very different ownership proposition from an early 550i.
S63 — The M Division V8
The S63 is the high-performance M division derivative of the N63, fitted to the F10 M5, F12/F13 M6, X5 M, and X6 M. It is a more heavily engineered unit than the N63, with revised internals, increased boost, and significantly higher power outputs ranging from 553 hp in the original S63 to over 600 hp in Competition specification. The S63 carries many of the N63’s cooling and oil consumption sensitivities but rewards meticulous maintenance with genuinely extraordinary performance.
S65 — The Naturally Aspirated V8
The S65 is the 4.0-litre naturally aspirated V8 that powered the E90/E92/E93 M3 from 2007 to 2013. It is the only naturally aspirated V8 in BMW’s road car history — a high-revving masterpiece that produces 414 hp and an 8,250 rpm redline in standard form. It is also an engine that demands respect: main bearing wear is a known issue on cars that have not received regular oil changes, and rod bearing inspection at high mileage is advisable. But in good condition, it remains one of the most compelling BMW engines ever made.
BMW V10 Engine. BMW S85 — The F1-Derived Legend.
The BMW V10 is not something you will find in any car produced after 2010. The BMW S85 engine is a 5.0-litre naturally aspirated V10 fitted exclusively to the E60 M5 saloon and E63/E64 M6 coupe and convertible between 2005 and 2010. It is derived directly from BMW’s Formula 1 engine programme, effectively a detuned racing engine adapted for road use, with an 8,250 rpm redline and a sound that remains one of the greatest produced by any road car engine.
The S85 is extraordinary and demanding in equal measure. Rod bearing wear at high mileage is the most significant concern — many specialist owners replace the rod bearings proactively as a precautionary measure, regardless of condition. The SMG gearbox fitted to the E60 M5 is a separate area of ownership risk. The throttle actuator units are known to fail and are increasingly scarce.
Owning an S85-powered car in 2026 is a labour of love. Replacement BMW parts are expensive, specialists are rare, and the maintenance commitment is substantial. The reward is access to one of the most visceral, driver-focused engines BMW has ever produced, and arguably one of the greatest naturally aspirated road car engines of the modern era.
S85 ownership note: If you are buying an E60 M5 or E63/E64 M6, budget for rod bearing inspection regardless of mileage, a full throttle actuator assessment, and specialist BMW M V10 experience from your chosen garage. This is not an engine for the casual buyer, but for the right owner, it is incomparable.
Which BMW Engine Is Right for You?
The right BMW engine depends entirely on what you want from the car. For fuel economy and low running costs, the B47 diesel four-cylinder is hard to beat. For outright driving pleasure, the B58 petrol straight-six is the modern benchmark. For legendary status and mechanical theatre, the S85 V10 and S65 V8 remain in a class of their own.
MT Auto Parts stocks used BMW engine parts for sale across the full four-cylinder, six-cylinder, and V8 range for 2012-onwards F, G, and U-generation models. Free VIN matching ensures the correct part for your specific car. Browse our full stock at mtautoparts.com or contact us on WhatsApp: +44 (0) 7539 892 169.
Disclaimer: Power outputs, model fitments, and production dates are approximate and vary by market, specification, and model year. Always confirm engine compatibility using your VIN before ordering parts.
