BMW X6 40d Engine ReplacementCompare 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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From Turbo Diesel - from £1,800 to £4,800
Used from £1,200 · Reconditioned from £2,200 · Common codes: N57D30B, B57D30B
From £1,200
Tested, bare/short engine
From £2,200
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best BMW X6 40d Replacement Engineto Finding the Best BMW X6 40d Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 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.
Variant HistoryBMW 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.
BMW X6 40d
Fuel TypeDiesel (MHEV from 2020)
Engine Size3.0L (2,993cc)
Power Output Range306-340hp across the variant's historyEngine History Timeline
N57D30B twin-turbo diesel introduced in E71 X6 xDrive40d 306hp, 600Nm
N57D30B updated for F16 X6 xDrive40d 313hp, 630Nm, Euro 6 emissions
B57D30B begins replacing N57 in late F16 models 313hp, revised timing chain design
B57D30B with 48V mild hybrid launched in G06 X6 xDrive40d 340hp, 700Nm, Euro 6d
G06 LCI updates B57D30B with enhanced mild hybrid system power unchanged
Key Specs Snapshot
Fuel TypeDiesel (MHEV from 2020)Engine Size3.0L (2,993cc)Power Output Range306-340hp across the variant's historyYears Produced2010-presentEvery 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.
BMW X6 40d Engine Codes - Specifications & Replacement CostBMW X6 40d Engine Codes - Specifications & Replacement Cost
3.0L Twin-Turbo Diesel (2010-2019)
Power Output306-313hp (225-230kW)Torque630Nm from 1,500rpmYears Fitted2010-2019 (E71 LCI, F16)Engine FeaturesAluminium block, sequential twin-turbocharging, common-rail direct injection (up to 2,000 bar), rear-mounted timing chain
Compatible Trim Levels
- xDrive40d (E71 LCI 2010-2014)
- xDrive40d (F16 2014-2019)
- xDrive40d M Sport
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£1,200-£2,500
Reconditioned
Addressed known issues, tested
£2,200-£4,000
Rebuilt
Full teardown, upgraded internals
£3,200-£5,200
Common Failure
EGR cooler failure causing coolant loss and white smoke - a BMW recall issue affecting many N57-equipped vehicles. Timing chain tensioner wear is also a significant concern on higher-mileage units.
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.
Why E71 and F16 X6 40d Engines Fail
Affected Vehicles
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.
Why It Happens
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.
Dealer (parts + labour)
£2,200-£3,200
Specialist (parts + labour)
£1,400-£2,200
What it involves
Replace timing chain, tensioner, guides, sprockets. Engine remains in vehicle.
Suitability
80,000-100,000 miles. Only viable if chain has not jumped or snapped.
1 - 2 daysDealer (parts + labour)
£7,500-£10,000
Specialist (parts + labour)
£4,500-£7,000
What it involves
Supply & fit fully rebuilt engine with upgraded chain components, bench tested, 12-month warranty
Suitability
100,000+ miles. Only option if chain has snapped causing valve/piston damage.
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Preventative - Timing Chain & Tensioner Replacement Minor | £2,200-£3,200 | £1,400-£2,200 | Replace timing chain, tensioner, guides, sprockets. Engine remains in vehicle. | 80,000-100,000 miles. Only viable if chain has not jumped or snapped. | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £7,500-£10,000 | £4,500-£7,000 | Supply & fit fully rebuilt engine with upgraded chain components, bench tested, 12-month warranty | 100,000+ miles. Only option if chain has snapped causing valve/piston damage. | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical E71 X6 40d is worth £4,000-£12,000; an F16 X6 40d is worth £8,000-£22,000 (`[THIRD-PARTY]` - Auto Trader market observation). For an E71 X6 40d worth under £6,000, a rebuilt engine at £4,500-£7,000 can represent 60-100% of the vehicle's value - evaluate body, gearbox, and interior condition carefully before committing. For F16 examples worth £10,000+, replacement is generally viable. Sub-£5,000 E71 examples should be assessed for scrap value first.
Our Recommendation
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.
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 rebuilt N57D30B engine prices for your BMW X6 40d
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific BMW X6 40d. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW X6 40d Engine ReplacementFrequently Asked Questions
Question 1How 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
Question 2Is 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
Question 3What'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
Question 4What 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
Question 5How 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
Question 6Is 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
Why Choose UsCompare BMW X6 40dEngine PricesToday
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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.
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