Your BMW 6 Series 640d is a remarkable diesel grand tourer that blends power and efficiency. When the 3.0-litre N57D30B unit in your 640d BMW engine starts knocking or loses compression, you need a reliable replacement without breaking the bank. At BM Engine Works, we specialise in used and reconditioned BMW engines. We supply complete engines for the BMW 6 Series, including the F12 640d and F13 640d Gran Coupé, and offer a supply and fit service from our in-house team. Every engine we sell is inspected by BMW engine specialists and comes with a warranty of up to 12 months. We provide vehicle recovery, fast turnaround and UK-wide delivery, so you can get your BMW back on the road quickly. Our stock includes low-mileage used engines and fully rebuilt units. We are careful to match the BMW 640d engine code (N57D30B) to your vehicle, ensuring you get the right engine for your BMW. You can buy a complete engine or ask us to rebuild your existing one if you prefer a reconditioned option. Whether you need a standard replacement engine for your 640d or a rebuilt unit, we offer supply and fit packages with up to 40% online discount and optional warranty for peace of mind.
The BMW 640d uses the N57D30B engine. The BMW 640d engine size is 3.0 litres. The full BMW 640d engine specs show it is an inline-six diesel that produces 230 kW (313 hp) and 630 Nm of torque between 1,500 – 2,500 rpm. This twin-power n57d30b turbo engine is mounted longitudinally at the front and drives the rear wheels. The cylinder block is cast aluminium with steel liners, and it uses a common rail injection system and intercooler to deliver high torque at low revs. BMW fitted this power unit to 6 Series models built between 2011 and 2018. Its 84 mm bore and 90 mm stroke give a capacity of 2,993 cc, and the compression ratio of 16.5:1 helps deliver low fuel consumption (around 5.5–5.7 L per 100 km).
The standard 640d engine code is N57D30B, and BMW also refers to this unit as the M57D30 (306D5) in earlier 6 Series models. The F12 convertible, F13 coupe and F06 Gran Coupe share the same engine code and similar power output. When buying a replacement engine, it is essential to select the right code and capacity. Our stock includes complete engine N57D30B units and N57D30B engines for the BMW 6 Series F12 and F13. We also carry other 6 Series engines – such as the N52B30A, N62B44A and N63B44A – for customers with petrol models. Each engine is checked for oil pressure, compression and timing chain condition before sale, and we record the vehicle identification number so that you can match the right engine for your BMW.
The BMW 640d uses the N57D30B straight-six diesel engine. Owners of the F12 convertible and F13 coupé models should know about a few common N57D30B problems.
A major concern is the timing chain. This chain is at the back of the engine and can stretch over time. This leads to rattles, especially at start-up. If the n57d30b timing chain fails, it causes big engine damage, often needing a full replacement or rebuild. Main and connecting rod bearing wear is another serious issue, often linked to low oil pressure at low engine speeds. Bearing failure can mean you need a replacement 6 series engine for sale. The n57d30b turbo unit can also have problems, especially on higher mileage cars. Furthermore, the exhaust gas recirculation (EGR) valve and cooler can get blocked with carbon soot. This causes rough running and poor fuel economy. Regular, more frequent oil changes are crucial to help stop these problems and keep the engine running well. Always ensure any replacement parts will fit in your vehicle correctly.
Our business specialises in supplying and fitting reconditioned and used BMW engines. When you choose a reconditioned 640d engine from us, the unit has been stripped, cleaned and rebuilt with new seals, gaskets and any worn components replaced. Because reconditioning is labour-intensive, these engines often cost more than second-hand units, but they deliver greater reliability and often come with longer warranty periods. Our in-house engineers rebuild engines in a modern workshop, using OEM parts and the latest diagnostic equipment. Each engine undergoes pressure tests and bench running before we approve it for sale, ensuring it meets stringent quality standards.
A used engine is a previously run engine removed from a donor vehicle. It has been tested for basic functionality, but hasn’t been rebuilt. It’s a cost-effective option if you need a quick replacement and are comfortable with minor wear.
A reconditioned or rebuilt engine is stripped down and refreshed. Worn parts like bearings, piston rings and timing chains are replaced. The engine block and head are cleaned and machined, and it is reassembled to meet original specifications. The result is an engine that runs like new and often comes with a longer warranty.
Replacement cost depends on the model, engine size, condition and labour involved. Some engines, especially those requiring a full rebuild due to timing chain failure, can be expensive. Rather than listing prices, we encourage you to contact us for a personalised quote. We offer used engines at a lower cost and reconditioned engines with a warranty.
The BMW 640d uses the N57D30B engine—a 3.0-litre straight-six turbo diesel producing 230 kW (313 hp) and 630 Nm. It employs BMW TwinPower turbo technology and common rail direct injection.
Yes. The BMW 640d engine reliability is well regarded. The N57D30B engine in the 640d is known for strong performance and longevity. The turbocharged straight-six diesel produces 313 hp and 630 Nm, making the 640d the star of the 6 Series.
The N57D30B is an evolution of BMW’s diesel technology. When maintained correctly, it delivers strong torque and fuel economy. Some early N57 engines have experienced timing chain or bearing issues, so proactive maintenance is important. Our reconditioned engines include updated chains and tensioners to enhance reliability.
Timing chain issues have been reported in several BMW diesel engines built between 2006 and 2015, including the N47 four-cylinder, M57 and some N57 units. The chain is located at the rear of the engine and can stretch over time, possibly leading to severe engine damage.
For the BMW 640d engine oil, you should use a BMW-approved Longlife-04 oil, typically a 5W-30 or 0W-30 synthetic. The BMW 640d engine oil capacity is about 6.5-7.2 litres, depending on the specific model year. Always check your service book or ask our specialists for advice on the right oil.
Many reviewers consider the 640d the most dependable choice in the 6 Series range. The 640d’s 3.0-litre diesel engine produces 313 hp and 630 Nm and offers impressive performance and efficiency, making it “the star of the line-up”
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