BMW N47 vs M57 / M57N / M57N2 – Ranking of legendary diesels: performance, reliability and aftermarket parts costs

In the automotive world, BMW is renowned for its excellent diesel engines, combining performance, durability, and economy. Among them, the N47 and M57 engines, along with their M57N and M57N2 variants, deserve special mention. This post provides a comprehensive comparison of these legendary engines in terms of performance, reliability, and the availability and cost of aftermarket parts.

BMW N47 – a modern, highly efficient diesel engine

The BMW N47 engine is a four-cylinder diesel engine produced from 2007 to approximately 2013, known for its dynamic performance and exceptional fuel economy. Available in 1.6- and 2.0-liter variants (N47D16 and N47D20C ), it features an advanced common rail system with a turbocharger, providing flexibility and power output ranging from 94 to 215 hp. The N47 boasts high torque available even at low revs, resulting in a very enjoyable and dynamic driving experience, especially in models like the BMW F20 125d, F30 325d, and X1 E84 25d xDrive. The advantage? The lightweight aluminum block, high turbocharging efficiency, and excellent performance with low fuel consumption. It has won awards, including "International Engine of the Year." Disadvantages: The key issue is the timing chain at the rear of the engine, which wears out more quickly (around 100,000 km), and failure often means a major overhaul or engine replacement. Additionally, the EGR valves and turbochargers were prone to failure. BMW has made improvements in later versions, but the risk remains. Used Parts Costs : Affordable used turbochargers, manifolds and possibly complete units are readily available at Global Parts.

BMW M57 / M57N / M57N2 – the legend of six-cylinder diesels

The M57 engine is an inline six-cylinder diesel engine produced from the late 1990s to 2013. The M57N and M57N2 versions are further evolutions of this engine, characterized by greater power and improved refinement. The M57N2, installed in models such as the BMW e60 M57, BMW X5 E70 M57, and BMW e90 M57, offers power ranging from approximately 163 to 286 hp, and thanks to its precise injection system with piezoelectric injectors, it allows for performance exceeding many competing diesel engines. Its durability and tuning potential are widely appreciated in the automotive community. Advantages: massive torque, proven Garrett turbochargers, long service life – often exceeding 300,000 km without major failures. The M57N2 offers a more efficient cooling system and a DDE system with higher fuel pressure, which translates into better running smoothness. Faults: The most common are the turbo, EGR (with minor autoignition), and injectors. Swirl flap replacement is sometimes necessary, but overall costs are lower and repairs are simple. Aluminum versions (M57N2) are significantly lighter and more refined. Used parts costs: engine components such as (turbo, EGR, swirl valves) as well as complete M57N2 units are available at Global Parts – in high quality and original.

Performance and driving dynamics

Engine	Capacity	Power (hp)	Torque (Nm)	Engine type	Sample models
BMW N47	1.6 / 2.0	94-215	up to 450	4-cylinder diesel	F20 125d, F30 325d, E84 X1
BMW M57N2	3.0	163-286	up to 580	6-cylinder diesel	E60 M57, E92 M57, X5 M57
The M57N2 engine, thanks to its larger capacity and number of cylinders, offers higher power and torque, translating into better performance, especially during dynamic driving and overtaking. The N47, on the other hand, is a more economical engine, ideal for everyday driving and long journeys where low fuel consumption is paramount.

Reliability and common problems

BMW N47

Although the N47 engine is more modern, it does have its weaknesses. The most frequently cited problems include timing chain failure, which can lead to serious engine damage. There are also problems with the EGR valve and intake system contamination, which impact engine refinement and exhaust emissions. Nevertheless, with proper maintenance and regular replacement of consumable parts, the N47 is a durable and economical engine.

BMW M57 / M57N / M57N2

The M57 engine is characterized by excellent durability and strength. The M57N and M57N2 versions feature improved timing systems, resulting in increased reliability. Common faults include turbocharger wear, injection system issues, and high-pressure pump failure. However, thanks to its robust design and the use of genuine BMW parts, repair costs are often reasonable. This engine is known for its longevity, often exceeding 300,000 km.

Spare parts – availability and costs of BMW engines

N47 and M57N2 parts market

The availability of car parts for both engines is excellent, both in terms of original parts and used car parts from dismantling. There are many automotive shops and vehicle dismantling stations in Poland specializing in BMW parts, offering a wide selection of spare parts at attractive prices. These include turbochargers, injection pumps, timing belts, gaskets, and cooling system components, making servicing and repairs significantly easier.

Parts and repair costs

• M57N2 engine – due to its larger displacement and more complex design, parts and repair costs are higher than those of the N47. For example, a complete M57N2 engine can be found on the aftermarket for around 6,700 PLN, using only original or OEM parts.
• BMW N47 Engine – N47 parts are usually cheaper, but keep in mind the potential cost of replacing the timing chain, which is quite expensive and requires precise maintenance. N47 engines and parts like water pumps, injectors, and cooling system components are available at competitive prices on Allegro and other platforms.

BMW engine – which diesel should you choose?

Criterion	BMW N47	BMW M57 / M57N / M57N2
Performance	Good, economical	Very good, higher power and torque
Reliability	Good, but sensitive chain	Very good, durable and strong
Parts costs	Lower but expensive chain	Higher prices, but a wide range of parts
Parts availability	Very good (original and used)	Very good (original and used)
BMW models	F20, F30, E84 X1	E60, E92, X5 and others
BMW's N47 engine is a great option for those who value economy and modern solutions, while the M57N2 is a classic for fans of power and durability, ideal for larger BMW models like the BMW e60 M57 or BMW x5 E70 M57. In both cases, it's worth investing in original parts or proven used aftermarket parts to ensure trouble-free operation.
For BMW and diesel enthusiasts looking for the best solution, the choice between the N47 and M57N2 should be dictated by driving style, parts budget, and performance and durability preferences. In either case, using reputable automotive shops and trusted BMW parts suppliers is key to maintaining engine health.

FAQ – questions from fans and mechanics

Question	Answer
Are used turbochargers for BMW M57N2 worth it?	Yes – used turbochargers have very good parameters, especially for popular versions such as E60, X5 E70
Is it necessary to replace the N47 chain?	It's worth it – a failure can destroy your engine. Global Parts offers complete timing chain kits.
Which engine is better for tuning?	M57N2 – thanks to the aluminum block, greater capabilities, and better availability of aftermarket parts.
Is the N47 slow to warm up in winter?	Standard – but improved versions of the thermostat improve this aspect.