BMW 7 Series Engine Replacement Cost in UK

The BMW 7 Series is BMW’s flagship luxury saloon, with powerful engines and advanced technology. However, when a BMW 7 Series engine fails, the repair bill can be very high. A new engine from a BMW dealer can cost well over £15,000. Fortunately, reconditioned engines and a professional engine rebuild offer far more affordable options. At BMW Engines Specialists in Grays, UK, we supply, fit and rebuild 7 Series engines for drivers across the country. In this guide, we cover engine replacement costs in the UK, engine codes, specifications, common faults and nationwide delivery.

BMW 7 Series Engine Codes and Model Table

The 7 Series has used a wide range of diesel and petrol engines across its recent generations. Before you buy any BMW engine for sale, you need to know your exact engine code.

Model	Generation	Years	Engine Code	Size	Power	Torque
730d	E65 / E66	2002–2008	M57D30	3.0 L I6 diesel	218–231 PS	500–520 Nm
750i	E65 / E66	2005–2008	N62B48	4.8 L V8 petrol	367 PS	490 Nm
730d	F01 / F02	2008–2015	N57D30	3.0 L I6 diesel	245–258 PS	540–560 Nm
740d	F01 / F02	2009–2015	N57D30 (twin turbo)	3.0 L I6 diesel	306–313 PS	600–630 Nm
740i	F01 / F02	2008–2015	N54B30 / N55B30	3.0 L I6 petrol	320–326 PS	450 Nm
750i	F01 / F02	2008–2015	N63B44	4.4 L V8 petrol	407–450 PS	600–650 Nm
760Li	F01 / F02	2009–2015	N74B60	6.0 L V12 petrol	544 PS	750 Nm
730d / 740d	G11 / G12	2015–2022	B57D30	3.0 L I6 diesel	265–340 PS	620–700 Nm
750d	G11 / G12	2016–2022	B57D30 (quad turbo)	3.0 L I6 diesel	400 PS	760 Nm
740i / 745e	G11 / G12	2015–2022	B58B30	3.0 L I6 petrol	326–394 PS	450–600 Nm
750i	G11 / G12	2015–2022	N63B44 (TU)	4.4 L V8 petrol	450–530 PS	650–750 Nm
M760Li	G11 / G12	2017–2022	N74B66	6.6 L V12 petrol	585–609 PS	800–850 Nm

You can find your engine code on the engine block, in the service records or by sending us your VIN.

BMW 7 Series Engine Specifications

Here are the key specifications for the three most common 7 Series engines in the UK.

3.0 Diesel (N57D30)

Layout: Inline six-cylinder, DOHC, 24 valves
Displacement: 2,993 cc
Bore x stroke: 84.0 mm x 90.0 mm
Compression ratio: 16.5:1
Fuel system: Common-rail injection (piezo or solenoid)
Induction: Single turbo or twin turbos (740d)
Camshaft drive: Timing chain at the rear of the engine

3.0 Diesel (B57D30)

Layout: Inline six-cylinder, DOHC, 24 valves
Displacement: 2,993 cc
Bore x stroke: 84.0 mm x 90.0 mm
Compression ratio: 16.5:1
Induction: One to four turbochargers, depending on version
Block: Aluminium alloy

4.4 V8 Petrol (N63B44)

Layout: 90° V8, DOHC, 32 valves
Displacement: 4,395 cc
Bore x stroke: 89.0 mm x 88.3 mm
Induction: Twin turbos mounted inside the “hot V”
Fuel system: High-precision direct injection
Valve control: Valvetronic (on later TU versions)

These engines are smooth and powerful. However, they’re also complex, which is why engine replacement costs in the UK can vary so much.

How Much Does a Replacement BMW 7 Series Engine Cost?

The cost of a BMW 7 Series engine replacement depends on the engine type and the option you choose. Here’s a guide to typical UK prices:

New engine from a BMW dealer, fitted: often £15,000 to £25,000 or more
Used engine (supply only): around £2,500 to £6,000
Engine rebuild of your own unit: around £4,000 to £9,000
Reconditioned 3.0 diesel (N57 / M57), supplied and fitted: around £4,500 to £7,000
Reconditioned 3.0 diesel (B57), supplied and fitted: around £5,500 to £8,500
Reconditioned 3.0 petrol (N54 / N55 / B58), supplied and fitted: around £5,000 to £8,000
Reconditioned 4.4 V8 (N63), supplied and fitted: around £7,500 to £12,000
Reconditioned 6.0 / 6.6 V12 (N74), supplied and fitted: around £12,000 to £18,000 or more

As you can see, a reconditioned engine can save you thousands compared with a dealer replacement. Unlike many used engines, it also comes with a warranty.

These figures are only a guide. Your final cost depends on your model, its condition and any extra parts needed. That’s why we always provide a fixed, itemised quote before any work begins.

What Affects Engine Replacement Costs in the UK?

Several factors affect the final price of a BMW engine replacement.

1. Engine size and type. A V8 or V12 costs much more to source and rebuild than a six-cylinder diesel. For example, the N74 V12 has two turbos, two sets of injectors and more parts overall.

2. New, used or reconditioned. New engines cost the most. Used engines are cheapest but carry more risk. Reconditioned engines offer the best balance.

3. Labour time. Many 7 Series engines are tightly packaged. On the N57, for example, the timing chain sits at the rear, so the engine usually needs to come out. In addition, xDrive models can take longer.

4. Extra parts. Turbos, injectors, high-pressure fuel pumps, the DPF and cooling parts may also need replacing.

5. Cause of failure. The original cause must be fixed, such as oil starvation or overheating. Otherwise, the new engine could fail as well.

6. Coding and software. Modern BMWs need the engine and modules coded correctly after fitting.

In short, a detailed quote from a specialist gives you the clearest and fairest price.

Common BMW 7 Series Engine Problems

Some 7 Series engines have well-known weak points that often lead to engine replacement.

N57 diesel: Timing chain wear can occur, and the chain sits at the back of the engine. Swirl flap, EGR cooler and injector faults are also common.

M57 diesel (older models): Swirl flaps can break and drop into the cylinders, causing serious damage. In addition, turbos and injectors wear at high mileage.

N63 V8 petrol: This engine is known for high oil consumption, worn valve stem seals, timing chain wear and injector failure. Because the turbos sit inside the V, heat can damage seals and pipes.

N54 / N55 petrol: Common problems include high-pressure fuel pump failure, injector faults and turbo wastegate rattle.

N74 V12: Coil pack, injector and oil leak problems are the most common.

B57 diesel: This engine is generally reliable. However, oil dilution and EGR problems can occur with poor maintenance.

Warning signs include knocking noises, a rattle on start-up, heavy smoke, high oil use, warning lights and loss of power. If you notice any of these, book an inspection at a specialist BMW engine garage in Grays straight away.

Reconditioned Engines vs Used Engines

When comparing reconditioned engines vs used engines, BMW owners need to think about long-term reliability. A used 7 Series engine comes from a donor car with an unknown history. If it’s an N63 or N57, it may already have worn timing chains, tired injectors or high oil consumption. As a result, it could fail soon after fitting.

Reconditioned engines, on the other hand, are fully stripped, cleaned and inspected. We replace worn parts such as bearings, piston rings, timing chains, guides, tensioners, valve stem seals and gaskets. Next, we check and machine the crankshaft and cylinder heads where needed. On older M57 diesels, we also remove or replace the swirl flaps to prevent failure. Finally, every engine is rebuilt to factory tolerances and tested before dispatch.

A reconditioned engine also comes with a warranty, while most used engines don’t. Although a used engine may look cheaper, you’ll pay for fitting twice if it fails. That’s why most of our customers choose to shop for reconditioned BMW engines rather than used units.

Engine Rebuild and Supply and Fit Services With No Upfront Charges

If your engine’s block and crankshaft are still in good condition, an engine rebuild may be the best option. However, if the damage is severe, a reconditioned replacement is usually faster and better value. Our BMW engine works team will inspect your engine and explain both options clearly.

Our supply and fit services cover everything. First, we source or rebuild the correct engine for your VIN. Next, we fit it at our BMW engine garage in Grays with fresh oil, filters, coolant and new gaskets. After that, we code the engine, update the software and road-test the car before handover.

Most importantly, we offer No Upfront Charges and No Deposit Required. You only pay once the job is complete and you’re fully satisfied. This takes the risk out of a major repair.

Every engine also comes with a warranty for extra peace of mind. Whether you drive a 730d, a 740d, a 750i or an M760Li, we can help. If you’re ready to buy a reconditioned BMW 7 Series engine, contact BMW Engines Specialists today for a free, no-obligation quote.

UK-Wide Logistics and Delivery From Grays

BMW Engines Specialists is based in Grays, Essex, but we serve BMW owners across the whole UK. Our logistics service makes engine replacement easy, wherever you are.

If your 7 Series can’t be driven, we can arrange vehicle recovery to our workshop from England, Scotland and Wales. Once the work is complete, we can return the car to your home or business. Alternatively, if you prefer to use your local garage, we can deliver the engine directly to them.

Every engine is secured to a pallet, sealed against dirt and moisture, and shipped with a trusted courier. In addition, you get tracking updates from dispatch to delivery, so you always know when it will arrive.

Our Grays location is close to the M25, A13 and Port of Tilbury. As a result, we can deliver quickly to London, Essex, Kent and the rest of the country. Next-day delivery is also available on most stock engines. Simply put, you can shop with us online or by phone, and we’ll handle the rest.

Frequently Asked Questions

1. How much does a BMW 7 Series engine replacement cost in the UK?

A reconditioned engine supplied and fitted usually costs between £4,500 and £12,000, depending on the engine. V12 engines can cost more.

2. Which BMW 7 Series engine is the most reliable?

The B57 diesel and B58 petrol engines are generally the most reliable. The N63 V8 tends to have the most problems.

3. Is a reconditioned engine better than a used one?

Yes. A reconditioned engine has new wear parts and comes with a warranty. A used engine may already have hidden faults.

4. Do I need to pay a deposit?

No. We offer No Upfront Charges and No Deposit Required, and you only pay once the job is complete.

5. Do you deliver BMW engines across the UK?

Yes. We offer tracked nationwide delivery and vehicle recovery from our base in Grays, Essex.