How much does a BMW X6 40d engine replacement cost in the UK-

A BMW X6 40d engine replacement typically costs £1,800-£4,800 supply-only for rebuilt units, or £4,500-£7,000 fitted by a specialist. Prices vary by generation and engine code. Used N57D30B engines: £1,200-£2,500 supply-only. Reconditioned units: £2,200-£4,000 supply-only. Professional fitting adds £1,000-£2,000 including ECU coding. B57D30B units from G06 command premium pricing: £4,000-£6,500 reconditioned.

Is the BMW X6 40d N57 engine reliable- I keep hearing about timing chain failure.

The N57D30B diesel engine in the X6 40d is powerful and smooth, but timing chain failure on pre-2015 models is a genuine risk - typically between 80,000 and 130,000 miles. N57 timing chain rattle is the first warning sign - address immediately. Preventative chain replacement costs far less than a full engine rebuild. Post-2015 B57 diesel engines have improved chain design and fewer failures. Some owners report complete engine failure without prior warning symptoms. A snapped N57 timing chain causes catastrophic valve and piston contact, requiring a full replacement engine.

What's the difference between the N57D30B and B57D30B in the X6 40d-

The N57D30B (2010-2019) produces 306-313hp and 630Nm, while the B57D30B (2015-present) produces 340hp and 700Nm with 48V mild hybrid assistance. N57D30B: Twin-turbo, rear-mounted timing chain (known weakness). B57D30B: Two-stage turbocharging, revised timing chain design, 48V mild hybrid. B57D30B offers improved fuel economy and lower emissions (Euro 6d). B57D30B introduced in G06 from 2020 with 11hp electric boost.

What are the signs of EGR cooler failure in a BMW X6 40d-

The classic symptoms are coolant loss without visible external leaks, white smoke from the exhaust, and a sweet smell from the exhaust pipe. In some cases, the engine may run rough or trigger a warning light. Coolant level drops without visible leaks is the earliest warning sign. White smoke from exhaust (steam from coolant burning). BMW issued recalls for EGR cooler defects on many N57-powered models. Ignoring EGR cooler failure can lead to cracked cylinder head and full engine replacement.

How long does a BMW X6 40d engine last before needing replacement-

A well-maintained BMW X6 40d diesel engine typically lasts 150,000-200,000 miles before major failure. N57D30B engines: timing chain work often needed 80k-130k miles. B57D30B engines: expected to exceed 200,000 miles with proper care. Annual oil changes (not just BMW's extended intervals) are critical for longevity. EGR cooler and DPF maintenance significantly impact engine life.

Is it worth replacing the engine on a high-mileage BMW X6 40d-

For an E71 X6 40d worth £4,000-£12,000, a £4,500-£7,000 rebuilt engine can make financial sense if the body and gearbox are sound. For F16 and G06 examples, replacement is generally viable given higher retained values. Compare replacement cost against vehicle value - specialist advice: replacement viable up to 70% of car's value. E71s with timing chain failure often scrapped - but rebuilt engines can save otherwise-good examples. B57D30B engines in G06 command higher value - replacement more easily justified. Always factor 12-month warranty into replacement decision.

BMW X6 40d SPECIALISTS

BMW X6 40d Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK BMW X6 40d engine specialists. Compare prices on reconditioned, rebuilt and used twin-turbo diesel engines for the E71, F16 and G06 X6 - supply & fit available nationwide.

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BMW X6 40d Engine

from£1,800 to £4,800

Usedfrom £1,200
Reconditionedfrom £2,200
Common codesN57D30B, B57D30B

BMW x6Used Engine — N57D30B

BMW x6 40d Reconditioned Engine — N57D30B

BMW x6Reconditioned Engine — N57D30B

BMW x6Rebuilt Engine — N57D30B

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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

BMW X6 40d Engine History & Specs at a Glance

The BMW X6 40d badge first appeared on the E71 facelift in 2010, positioned above the 30d and below the later M50d as the twin-turbo diesel performance choice. Evolving from the N57D30B through to the B57D30B with mild hybrid technology, the 40d has been the X6's premium diesel offering across three generations - delivering the ideal balance of effortless torque, motorway refinement and real-world economy.

2010
N57D30B twin-turbo diesel introduced in E71 X6 xDrive40d, 306hp, 600Nm
2014
N57D30B updated for F16 X6 xDrive40d, 313hp, 630Nm, Euro 6 emissions
2015
B57D30B begins replacing N57 in late F16 models, 313hp, revised timing chain design
2020
B57D30B with 48V mild hybrid launched in G06 X6 xDrive40d, 340hp, 700Nm, Euro 6d
2023
G06 LCI updates B57D30B with enhanced mild hybrid system, power unchanged

Every engine fitted to the BMW X6 40d is covered below, with UK rebuilt pricing and known failure points specific to each twin-turbo diesel generation.

Engine Codes & Pricing

BMW X6 40d Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

N57D30B — 3.0L Twin-Turbo Diesel (2010-2019)

Power Output: 306-313hp (225-230kW)
Torque: 630Nm from 1,500rpm
Years Fitted: 2010-2019 (E71 LCI, F16)
Engine Features: Aluminium block, sequential twin-turbocharging, common-rail direct injection (up to 2,000 bar), rear-mounted timing chain

Can’t find your exact engine code?-> Get quotes for N57D30B BMW X6 40d engine replacement

-> Get quotes for N57D30B BMW X6 40d engine replacement

Common Problems

BMW X6 40d Engine Problems Repair Cost vs Replacement

The BMW X6 40d's twin-turbo diesel engines deliver effortless performance, but both the N57 and B57 families have well-documented weaknesses. The N57D30B in E71 and F16 models is prone to timing chain wear and EGR cooler failure, while the B57D30B in G06 models suffers from AdBlue system issues and DPF-related problems. Every rebuilt engine supplied through EnginesMarket includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty.

Common failure points and repair options

N57 Timing Chain Failure

Affected: BMW X6 40d (E71 LCI 2010-2014, F16 2014-2019, N57D30B)
Typical failure mileage: 80,000-130,000 miles (120,000-200,000 km)

Root cause

The N57 engine places the timing chain at the rear of the engine block. Chain tensioner failure allows slack to develop, causing guide breakage. If ignored, the chain can snap, allowing pistons to contact valves - catastrophic engine failure requiring full replacement.

Repair options

Repair tier	Dealer price	Specialist price
Preventative - Timing Chain & Tensioner Replacement	£2,200-£3,200	£1,400-£2,200
Full Replacement - rebuilt/reconditioned engine	£7,500-£10,000	£4,500-£7,000

Our recommendation

If your N57-powered X6 40d develops a cold-start rattle that disappears as the engine warms, act immediately - preventative chain replacement saves thousands. Once the chain snaps, the engine is beyond economic repair. For an X6 40d worth £6,000-£15,000, a rebuilt engine with upgraded components represents better value than dealer replacement at nearly the vehicle's value.

-> Compare rebuilt N57D30B engine prices for your BMW X6 40d

EGR Cooler Failure

Affected: BMW X6 40d (E71 LCI 2010-2014, F16 2014-2019, G06 2020-present, N57D30B, B57D30B)
Typical failure mileage: 60,000-100,000 miles

Root cause

The exhaust gas recirculation (EGR) cooler develops internal cracks due to thermal cycling between 700°C exhaust gases and engine coolant. Coolant leaks into the intake manifold, causing misfires, white smoke, and loss of power. BMW has issued multiple recalls for EGR cooler defects affecting nearly 800,000 diesel vehicles.

Repair options

Repair tier	Dealer price	Specialist price
EGR Cooler Replacement	£900-£1,400	£550-£850
Full Replacement - rebuilt/reconditioned engine	£7,500-£10,000	£4,500-£7,000

Our recommendation

An EGR cooler failure caught early is a £550-£850 specialist fix - don't ignore the low coolant warning light. If you've already driven through misfires, get a compression test before anything else. On a high-mileage X6 40d (120,000+), if the cooler has failed twice, consider an aftermarket upgraded cooler. Never let a dealer sell you an engine for EGR cooler failure without a compression test first.

-> Get quotes for BMW X6 40d EGR cooler replacement and rebuilt engines

AdBlue System Failure

Affected: BMW X6 40d (G06 2020-present, B57D30B)
Typical failure mileage: 40,000-80,000 miles

Root cause

The B57D30B's two-stage NOx exhaust gas treatment system - featuring an oxidation catalyst converter and selective catalytic reduction (SCR) coating on the particulate filter - can suffer from AdBlue crystallisation. The second dosage unit at the SCR outlet is particularly vulnerable to blockage. Symptoms include emissions warnings, reduced power, and in severe cases, limp mode.

Repair options

Repair tier	Dealer price	Specialist price
AdBlue System Cleaning	£300-£500	£150-£250
SCR/AdBlue Component Replacement	£900-£1,500	£550-£900

Our recommendation

On any G06 X6 40d, use only high-quality AdBlue and avoid letting the tank run empty - crystallisation is far more likely if the system runs dry. If you see an emissions warning, get it diagnosed immediately. A £150-£250 cleaning is cheap insurance against a £900+ component replacement.

-> Compare BMW X6 40d AdBlue system repair and engine quotes

DPF Blockage

Affected: BMW X6 40d (E71 LCI 2010-2014, F16 2014-2019, G06 2020-present, N57D30B, B57D30B)
Typical failure mileage: 80,000-130,000 miles (sooner on urban-only cars)

Root cause

Repeated short journeys prevent passive DPF regeneration. Ash builds up beyond the ECU's ability to force-regenerate. Eventually, back pressure damages the turbo or cracks the exhaust manifold.

Repair options

Repair tier	Dealer price	Specialist price
Forced DPF Regeneration	£300-£500	£150-£250
DPF Removal & Professional Cleaning	£800-£1,300	£450-£750
Full Replacement - DPF + Turbo Inspection	£2,500-£4,000	£1,800-£3,200

Our recommendation

If your X6 40d is a town car doing under 15,000 miles per year, a DPF cleaning every 2-3 years is cheaper than an engine replacement. Once you see "Drivetrain malfunction - continued driving possible", get a forced regeneration immediately - ignoring it will kill the turbo. On an X6 40d worth under £8,000, a £450-£750 cleaning is sensible; over £8,000, consider a new DPF if you plan to keep the car for 3+ years.

-> Compare BMW X6 40d DPF cleaning and replacement quotes

Don't Let Engine Failure Write Off Your BMW X6 40d

A failed engine doesn't have to mean the end of the road for your X6 40d. Whether you're facing N57 timing chain failure, EGR cooler issues, AdBlue system problems, or DPF blockage, EnginesMarket connects you with trusted UK BMW X6 40d specialists who supply rebuilt engines with upgraded components specifically designed to address the original failure point. Every engine comes with a minimum 12-month unlimited mileage warranty, nationwide delivery, and supply & fit options across the UK. Compare prices today - and get back on the road without paying the main dealer premium.

Compare BMW X6 40d Engine Replacement Prices Now ->

FAQ

BMW X6 40d Engine ReplacementFrequently Asked Questions

Everything BMW X6 40d owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

A BMW X6 40d engine replacement typically costs £1,800-£4,800 supply-only for rebuilt units, or £4,500-£7,000 fitted by a specialist. Prices vary by generation and engine code.

Used N57D30B engines: £1,200-£2,500 supply-only
Reconditioned units: £2,200-£4,000 supply-only
Professional fitting adds £1,000-£2,000 including ECU coding
B57D30B units from G06 command premium pricing: £4,000-£6,500 reconditioned

-> Compare BMW X6 40d engine replacement prices from UK specialists

The N57D30B diesel engine in the X6 40d is powerful and smooth, but timing chain failure on pre-2015 models is a genuine risk - typically between 80,000 and 130,000 miles.

N57 timing chain rattle is the first warning sign - address immediately
Preventative chain replacement costs far less than a full engine rebuild
Post-2015 B57 diesel engines have improved chain design and fewer failures
Some owners report complete engine failure without prior warning symptoms

-> Get quotes for BMW X6 40d N57 engine replacement with warranty

The N57D30B (2010-2019) produces 306-313hp and 630Nm, while the B57D30B (2015-present) produces 340hp and 700Nm with 48V mild hybrid assistance.

N57D30B: Twin-turbo, rear-mounted timing chain (known weakness)
B57D30B: Two-stage turbocharging, revised timing chain design, 48V mild hybrid
B57D30B offers improved fuel economy and lower emissions (Euro 6d)
B57D30B introduced in G06 from 2020 with 11hp electric boost

-> Compare N57D30B and B57D30B engine prices for your X6 40d

The classic symptoms are coolant loss without visible external leaks, white smoke from the exhaust, and a sweet smell from the exhaust pipe. In some cases, the engine may run rough or trigger a warning light.

Coolant level drops without visible leaks is the earliest warning sign
White smoke from exhaust (steam from coolant burning)
BMW issued recalls for EGR cooler defects on many N57-powered models
Ignoring EGR cooler failure can lead to cracked cylinder head and full engine replacement

-> Get quotes for BMW X6 40d EGR cooler replacement

A well-maintained BMW X6 40d diesel engine typically lasts 150,000-200,000 miles before major failure.

N57D30B engines: timing chain work often needed 80k-130k miles
B57D30B engines: expected to exceed 200,000 miles with proper care
Annual oil changes (not just BMW's extended intervals) are critical for longevity
EGR cooler and DPF maintenance significantly impact engine life

-> Find a long-life rebuilt BMW X6 40d engine with 12-month warranty

For an E71 X6 40d worth £4,000-£12,000, a £4,500-£7,000 rebuilt engine can make financial sense if the body and gearbox are sound. For F16 and G06 examples, replacement is generally viable given higher retained values.

Compare replacement cost against vehicle value - specialist advice: replacement viable up to 70% of car's value
E71s with timing chain failure often scrapped - but rebuilt engines can save otherwise-good examples
B57D30B engines in G06 command higher value - replacement more easily justified
Always factor 12-month warranty into replacement decision

-> Check BMW X6 40d engine replacement value for your specific model year

Why Choose Us

Compare BMW X6 40d Engine Prices Today

Comparing quotes for your BMW X6 40d is free, no-obligation, and specific to your exact twin-turbo diesel and its engine code - N57D30B or B57D30B. Whether you need a used replacement, a reconditioned unit, or a full rebuilt engine with upgraded components, our network of trusted UK BMW diesel specialists delivers transparent pricing and nationwide coverage. Don't let a failed engine end the life of the X6's premium diesel choice - compare prices today and get back on the road with confidence.

11,000+11,000+ BMW X6 engines supplied through our network, including 40d variants

12-Month12-Month Warranty on every rebuilt X6 40d engine

NationwideNationwide UK delivery

Get Free BMW X6 40d Engine Quotes ->

Compare quotes from trusted UK BMW X6 40d engine specialists with warranty-backed rebuilt, reconditioned and used options nationwide.

BMW X6 40d Engine Replacement Compare Prices & Get Quotes

Get your free BMW x6 40d engine quotes

3 Simple Steps to Finding the Right Replacement Engine

BMW X6 40d Engine History & Specs at a Glance

BMW X6 40d Engine Codes Specifications & Replacement Cost

N57D30B — 3.0L Twin-Turbo Diesel (2010-2019)

BMW X6 40d Engine Problems Repair Cost vs Replacement

N57 Timing Chain Failure

EGR Cooler Failure

AdBlue System Failure

DPF Blockage

Don't Let Engine Failure Write Off Your BMW X6 40d

BMW X6 40d Engine ReplacementFrequently Asked Questions

Compare BMW X6 40d Engine Prices Today