BMW X6 xDrive35d / 40d2008–presentM57 / N57 / B57 3.0 Straight-Six Diesel

BMW X6 xDrive35d / 40d Engine Replacement —Compare Prices &
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Name: BMW X6 xDrive35d / 40d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW X6 xDrive35d and xDrive40d specialists. Compare reconditioned, rebuilt and used M57, N57 and B57 3.0-litre straight-six diesel engines — supply & fit available nationwide for BMW's Sports Activity Coupé.

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BMW X6 xDrive35d / 40d Engines — from £2,500 to £9,500Common codes: M57D30, N57D30, B57D30B

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Used
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The X6 xDrive35d / 40d Through Time — Era Map

Five generations. Five eras. One guide to reliability, costs and what really matters.

Era Note

Early M57 — 286 bhp, 580 Nm; robust but injector, turbo and timing chain issues are well-documented

Era Note

N57 — 306 bhp, 600 Nm; timing chain stretch, piezo injector failure and turbo oil starvation are key watchpoints

Era Note

Revised N57 — 313 bhp, 630 Nm; improved but injector failure can destroy engines

Era Note

B57 twin-turbo — 340 bhp, 700 Nm; refined and powerful but timing chain and DPF/EGR issues need monitoring

Era Note

Latest B57 with 48V mild hybrid — 352 bhp, 700 Nm; proven B57 engine with added MHEV complexity

Generation	Years	Engine Code	Recon Cost (Guide)	Era Note
X6 E71 (xDrive35d)	2008–2010	M57D30(3.0L I6 diesel, 286 bhp)	£3,500–£6,500[PLACEHOLDER]	Early M57 — 286 bhp, 580 Nm; robust but injector, turbo and timing chain issues are well-documented
X6 E71 / F16 (xDrive35d)	2010–2014	N57D30(3.0L I6 diesel, 306 bhp)	£4,000–£7,000[PLACEHOLDER]	N57 — 306 bhp, 600 Nm; timing chain stretch, piezo injector failure and turbo oil starvation are key watchpoints
X6 F16 (xDrive40d)	2014–2019	N57D30B(3.0L I6 diesel, 313 bhp)	£4,500–£7,500[PLACEHOLDER]	Revised N57 — 313 bhp, 630 Nm; improved but injector failure can destroy engines
X6 G06 (xDrive40d)	2019–2022	B57D30B(3.0L I6 diesel, 340 bhp)	£5,500–£8,500[PLACEHOLDER]	B57 twin-turbo — 340 bhp, 700 Nm; refined and powerful but timing chain and DPF/EGR issues need monitoring
X6 G06 LCI (xDrive40d)	2022–present	B57D30B(3.0L I6 diesel + 48V MHEV, 352 bhp)	£5,500–£9,500[PLACEHOLDER]	Latest B57 with 48V mild hybrid — 352 bhp, 700 Nm; proven B57 engine with added MHEV complexity

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UKCost Data
VerifiedReliability
ExpertInsights
Updated for2025

BMW X6 xDrive35d / 40d Engine Replacement Costs

Supply Only£4,000 – £7,500
Fitted (Indie)£5,200 – £9,000
Warranty12–24 months
Best ForMost owners — best cost/warranty balance

Engine Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£2,500 – £4,500	£3,500 – £5,800	1–6 months	Budget priority; vehicle under £10,000
Reconditioned Engine	£4,000 – £7,500	£5,200 – £9,000	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£5,500 – £9,500	£6,800 – £11,000	12–24 months	Long-term ownership; 3+ year horizon
Main Dealer New	£8,000 – £12,000	£9,500 – £14,000	24–36 months	Insurance jobs, warranty claims

Figures above reflect the current X6 xDrive40d range. Older generations: see the Era Map above for E71/M57, E71/F16/N57 and F16/G06/B57-specific pricing. BMW engine replacement costs typically range from £2,500 to over £10,000 depending on the engine model. A replacement engine for an X6 can cost between £4,500–£6,000, with dealer estimates often in the £14,000–£18,000 range.

Labour estimate: Fitting an X6 engine typically takes 10–14 hours at £75–£110/hr (independent) or £130–£180/hr (London/SE dealer). Labour costs for BMW engine replacements in the UK typically range from £800 to £3,000. [PLACEHOLDER — confirm vs cost sheet]

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Common Problems With BMW X6 xDrive35d / 40d Engines

1. Timing Chain Stretch & Failure(M57, N57, B57)

Symptoms: Rattling or clattering noise from the engine, especially during startup; engine warning light; loss of power; metallic noises; rough idling; potential engine failure if chain snaps.
Typical Mileage: 80,000–120,000 miles (N57) — one owner reported timing chain replacement at 152,000 miles
Repair Cost: £1,500–£3,500 (timing chain, tensioner and guide replacement) — one owner paid £1,800 for timing chain work
Replacement Cost: £4,000–£7,500 (if chain snaps and valves meet pistons)
Urgency: Immediate — if you hear rattle, book an inspection today

Our recommendation:

The N57 engine is prone to excessive timing chain wear which can lead to premature failure. Symptoms can include a rattle on start-up or a change in engine note where the chain is hitting on the guides — sometimes they give you no warning at all. A cold-start rattle is the early warning sign — ignore it and you risk piston-valve contact and a full engine replacement. Regular oil changes with the correct BMW-approved oil are the best prevention. At the first sign of rattle, get it inspected immediately. One X6 owner reported having to do the timing chain immediately after purchase at 152,000 miles.

1. Timing Chain Stretch & Failure(M57, N57, B57)

Symptoms: Rattling or clattering noise from the engine, especially during startup; engine warning light; loss of power; metallic noises; rough idling; potential engine failure if chain snaps.
Typical Mileage: 80,000–120,000 miles (N57) — one owner reported timing chain replacement at 152,000 miles
Repair Cost: £1,500–£3,500 (timing chain, tensioner and guide replacement) — one owner paid £1,800 for timing chain work
Replacement Cost: £4,000–£7,500 (if chain snaps and valves meet pistons)
Urgency: Immediate — if you hear rattle, book an inspection today

Our recommendation:

2. Piezo Injector Failure(N57 — E71, F16)

Symptoms: Rough idling, engine misfires, loss of power, decreased fuel efficiency, check engine light, smoke from exhaust, "Drivetrain Malfunction" warning.
Typical Mileage: 60,000–100,000 miles
Repair Cost: £500–£1,500 (fuel injector replacement)【PLACEHOLDER】
Replacement Cost: £4,000–£7,500 (if injector failure destroys the engine)
Urgency: Immediate — if you experience rough idling or loss of power, book an inspection immediately

Our recommendation:

Failure of piezo injectors is a well-documented issue on N57 engines. One X6 xDrive40d owner reported a catastrophic failure where the second cylinder injector failed, destroying the engine — covered by warranty at a cost of approximately £18,000. If you notice rough idling, misfires, or loss of power, have the injectors inspected immediately. Replacing a faulty injector before it fails completely can prevent engine destruction. Regular fuel filter changes and using high-quality diesel are the best prevention.

3. Turbocharger Oil Starvation & Failure(N57)

Symptoms: Loss of power, whistling or whining noise from the engine, excessive exhaust smoke, reduced fuel economy, engine warning light.
Typical Mileage: 80,000–120,000 miles
Repair Cost: £1,500–£3,500 (turbocharger replacement)【PLACEHOLDER】
Replacement Cost: £4,000–£7,500 (if turbo failure sends debris into the engine)【PLACEHOLDER】
Urgency: Immediate — if you hear whistling or experience power loss, book an inspection immediately

Our recommendation:

Oil starvation of the turbine is a common problem on the N57 engine. The powerful diesel engines in the X6 can show turbocharger problems, particularly if oil changes have been neglected. Turbocharger failures can lead to a loss of power and increased exhaust smoke. If you notice a whistling sound or loss of power, have the boost system inspected immediately. Regular oil changes with the correct BMW-approved oil and allowing the engine to cool after hard driving are the best prevention.

4. DPF & EGR System Issues(B57 — G06)

Symptoms: DPF warning light, reduced power, increased fuel consumption, frequent regeneration cycles, engine warning light, rough idle, "underboost code".
Typical Mileage: 40,000–80,000 miles (urban-driven cars are at higher risk)
Repair Cost: £200–£800 (DPF clean, forced regeneration, or sensor replacement)【PLACEHOLDER】
Replacement Cost: £1,500–£3,000 (DPF replacement)【PLACEHOLDER】
Urgency: Monitor — book inspection soon; can lead to costly emissions system damage

Our recommendation:

DPF clogging is a common issue on diesel X6 models, particularly on cars driven mostly in the city. One owner reported a DPF blockage causing an underboost code and the DPF being blocked, requiring a long drive to attempt regeneration. The EGR system can also fail, with the bypass flap bolts on the EGR module potentially loosening due to manufacturing defects. If you see a DPF warning light, take the car for a sustained motorway run at 2,000–2,500 rpm. If the light persists, have the DPF inspected. Regular motorway driving and using premium diesel can help keep the DPF healthy.

5. Connecting Rod Bearing & Crankshaft Issues(N57)

Symptoms: Knocking noise from the bottom of the engine, especially under load, low oil pressure warning, metallic debris in oil filter, eventual engine seizure.
Typical Mileage: 80,000–120,000 miles
Repair Cost: £3,000–£6,000 (bottom-end rebuild or replacement)【PLACEHOLDER】
Replacement Cost: £4,000–£7,500 (if catastrophic failure occurs)【PLACEHOLDER】
Urgency: Immediate — if you hear knocking, stop driving immediately

Our recommendation:

Cranking of the connecting rod bushings is a known problem on the N57 engine. If you hear a knocking noise from the bottom end, stop driving immediately and have it inspected. Regular oil changes with BMW-approved oil are the key prevention — many specialists recommend 8,000-mile intervals.

6. ZF 8HP Transmission Issues(All Generations)

Symptoms: Harsh or delayed shifting, jerky gear changes, torque converter shudder, transmission fluid leaks, failure to engage gear.
Typical Mileage: 60,000–100,000 miles
Repair Cost: £500–£2,000 (fluid change, mechatronic repair, or solenoid replacement)【PLACEHOLDER】
Replacement Cost: £3,000–£6,000 (if transmission requires full replacement)【PLACEHOLDER】
Urgency: Monitor — book inspection soon if shifting issues develop

Our recommendation:

The ZF 8HP transmission is widely used across BMW's range and is generally robust. However, common issues include worn clutches, defective solenoid valves in the transmission control unit and contaminated transmission fluid. Similar problems occur in the 30d and 40d diesel variants, but usually only after 100,000–150,000 kilometres. BMW's "lifetime fill" claim is widely disputed — many specialists recommend transmission fluid changes every 60,000–80,000 miles.

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X6 xDrive35d / 40d — Repair, Buy, or Replace?

Not every issue means a new engine.Here’s what can be repaired, when it makes sense, and what to check before you buy.

Can It Be Repaired?

Problem	Repairable?	Typical Cost	When It Makes Sense
Timing chain stretch (preventative)	Yes	£1,500 – £3,500	Catch it early — far cheaper than engine replacement
Piezo injector failure	Yes	£500 – £1,500	Replacement is straightforward; catch it before engine destruction
Turbocharger failure	Yes	£1,500 – £3,500	Viable if caught before debris enters engine
DPF clogging	Yes	£200 – £800	Cleaning or forced regeneration is cost-effective
EGR system failure	Yes	£400 – £1,200	Recall work may be available; out-of-warranty repair is still viable
Connecting rod bearing wear	Sometimes	£3,000 – £6,000	Viable if caught early; often requires full rebuild
Snapped timing chain	Usually No	Engine replacement	Piston-valve contact means little is left to repair

ProblemRepairable? · Typical Cost

Timing chain stretch (preventative)

Yes£1,500 – £3,500

Catch it early — far cheaper than engine replacement

Piezo injector failure

Yes£500 – £1,500

Replacement is straightforward; catch it before engine destruction

Turbocharger failure

Yes£1,500 – £3,500

Viable if caught before debris enters engine

DPF clogging

Yes£200 – £800

Cleaning or forced regeneration is cost-effective

EGR system failure

Yes£400 – £1,200

Recall work may be available; out-of-warranty repair is still viable

Connecting rod bearing wear

Sometimes£3,000 – £6,000

Viable if caught early; often requires full rebuild

Snapped timing chain

Usually NoEngine replacement

Piston-valve contact means little is left to repair

Buying This X6 xDrive35d / 40d? Check These First

Buy if:

Full service history with oil changes at 8,000–10,000 mile intervals (not BMW's extended CBS schedule)
E71 (2008–2014): injectors replaced or functioning correctly and no turbo noise
F16 (2014–2019): timing chain inspected and no cold-start rattle
G06 (2019+): no DPF or EGR warning lights and regular motorway use
Timing chain work already completed (especially on higher-mileage cars)
ZF 8HP transmission serviced every 60,000–80,000 miles

Avoid if:

No proof of regular oil changes — these engines are unforgiving of neglect
Cold-start rattle present — timing chain work is imminent and expensive
Any injector or turbo warning lights — potentially catastrophic failure ahead
DPF or EGR warning lights — emissions system repairs can be costly
Any engine warning light without diagnosis — these engines can hide expensive faults

Closing verdict

The BMW X6 xDrive35d and xDrive40d represent the performance diesel flagships of BMW's Sports Activity Coupé range. The E71's M57 and N57 engines offer proven performance but demand injector, turbo and timing chain vigilance. The F16's N57D30B is a solid performer but injector failure can be catastrophic. The G06's B57 is a significant step forward in performance and efficiency, with mild-hybrid technology on later cars, but DPF, EGR and timing chain issues need attention. Across all generations, one rule applies: oil-change discipline is everything. BMW's extended service intervals are widely considered inadequate — treat your X6 diesel to 8,000–10,000 mile oil changes and it will reward you with hundreds of thousands of miles of effortless motoring. One owner's experience sums it up: "A wonderful car to drive, much loved" but requiring vigilance — a replacement engine in February 2020 cost around £18,000 under warranty.

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Buying Checklist

Before you buy a used BMW X6 xDrive35d or xDrive40d (or before you commit to an engine replacement), check these:

1. Cold Start
Listen for rattle from the engine (timing chain warning — critical on N57 and B57)
2. Service History
Including which engine era (M57/N57/B57) and confirmed oil-change discipline (8k–10k miles max)
3. Injector Health
Any rough idle or misfires? (N57 injector failure warning)
4. Turbo Health
Any whistling, power loss, or smoke? (turbo oil starvation warning)
5. DPF Health
Any warning lights? Ask about regeneration frequency; urban cars will have more issues
6. EGR System
Any warning lights or loss of power? Check recall status
7. Transmission
Any harsh shifts or hesitation? ZF 8HP issues may be developing
8. Engine Warning Light
Have codes been read? Timing, injector, turbo, DPF, or EGR codes are most common

Why this matters

A 10-minute check now can save you thousands later. The right X6 xDrive35d / 40d is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

Before you buy a used BMW X6 xDrive35d or xDrive40d (or before you commit to an engine replacement), check these:

1
Cold Start
Listen for rattle from the engine (timing chain warning — critical on N57 and B57)
2
Service History
Including which engine era (M57/N57/B57) and confirmed oil-change discipline (8k–10k miles max)
3
Injector Health
Any rough idle or misfires? (N57 injector failure warning)
4
Turbo Health
Any whistling, power loss, or smoke? (turbo oil starvation warning)
5
DPF Health
Any warning lights? Ask about regeneration frequency; urban cars will have more issues
6
EGR System
Any warning lights or loss of power? Check recall status
7
Transmission
Any harsh shifts or hesitation? ZF 8HP issues may be developing
8
Engine Warning Light
Have codes been read? Timing, injector, turbo, DPF, or EGR codes are most common

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common X6 xDrive35d / 40d pitfalls.

Engine Codes

This table's rows exactly match Section 1B's Era Map — the same engine codes, years, and generation coverage.

M57D30 (E71 xDrive35d)

Years: 2008–2010
Power: 286 bhp (210 kW) · 580 Nm
2025 Enquiries: —(pattern data)[PATTERN DATA]
Avg. Recon Cost: £3,500–£6,500[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
M57D30 (E71 xDrive35d)	2008–2010	286 bhp (210 kW) · 580 Nm	—(pattern data)[PATTERN DATA]	£3,500–£6,500[PLACEHOLDER]
N57D30 (E71/F16 xDrive35d)	2010–2014	306 bhp (225 kW) · 600 Nm	—(pattern data)[PATTERN DATA]	£4,000–£7,000[PLACEHOLDER]
N57D30B (F16 xDrive40d)	2014–2019	313 bhp (230 kW) · 630 Nm	—(pattern data)[PATTERN DATA]	£4,500–£7,500[PLACEHOLDER]
B57D30B (G06 xDrive40d)	2019–2022	340 bhp (250 kW) · 700 Nm	—(pattern data)[PATTERN DATA]	£5,500–£8,500[PLACEHOLDER]
B57D30B (G06 LCI xDrive40d)	2022–present	352 bhp (259 kW) · 700 Nm	—(pattern data)[PATTERN DATA]	£5,500–£9,500[PLACEHOLDER]

Technical SpecsCurrent B57D30B — G06 LCI

Displacement: 2,993cc
Cylinders: 6-cylinder inline, 24 valves, DOHC
Fuel System: Common rail piezo direct injection
Turbocharger: Two-stage turbocharging with variable geometry
Mild Hybrid: 48V system with 12 PS (11 kW) starter generator
Transmission: 8-speed Steptronic automatic with xDrive all-wheel drive

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Market Intelligence

Real data from thousands of X6 xDrive35d / 40d enquiries in 2025.

Most Common FailureTiming chain wear and injector failure

50%

of X6 diesel-related enquiries cite chain, injector or turbo concerns

[PATTERN DATA]

Average Enquiry Mileage

60,000–100,000

miles

[PATTERN DATA]

Average Replacement Cost

£5,500

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

N57D30B

F16-era X6 xDrive40d is the most common X6 diesel on UK roads

[PATTERN DATA]

Peak Enquiry Season

Winter

Cold starts expose timing chain and injector issues

[PATTERN DATA]

Regional Demand

South East: 22%
London: 18%
North West: 13%
Other Regions: 47%

[PATTERN DATA]

Regional Demand Breakdown

18%London22%South East13%North West47%Other Regions

Frequently Asked Questions

A reconditioned X6 diesel engine typically costs £3,500–£9,500 supply only depending on generation and model. A replacement engine for an X6 can cost between £4,500–£6,000, with dealer estimates often in the £14,000–£18,000 range. Fitting adds £1,000–£1,800 at independent specialist rates. Use our calculator for a figure specific to your car.

It depends on which generation you're asking about. The M57 (E71, 2008–2010) is robust but injector and turbo issues are common. The N57 (E71/F16, 2010–2019) is prone to timing chain stretch, piezo injector failure, turbo oil starvation, and connecting rod bearing issues. The B57 (G06, 2019+) is generally regarded as a reliable unit, but timing chain and DPF/EGR issues have been reported. Across all, oil-change discipline is everything.

Timing chain stretch and failure (N57 and B57), piezo injector failure (N57), turbocharger oil starvation and failure (N57), DPF clogging and EGR system issues (B57), connecting rod bearing wear (N57), and ZF 8HP transmission issues. See the Era Map above for generation-specific advice.

Depends on vehicle value. Against a well-kept E71 X6 (values £5,000–£12,000+), a £4,000–£5,500 recon is 30–70% of the car's value — borderline but often worth it for a good example. Against a £10,000–£20,000 F16, a £4,500–£6,000 recon is 25–50% — often worth it. Against a £20,000–£40,000 G06, a £5,500–£6,500 recon is 15–25% — worth it. The BMW scrap threshold of 70% means evaluating the whole vehicle and its condition before committing.

Listed on the VIN plate and vehicle documentation. As a rule of thumb: E71 xDrive35d (2008–2010) = M57D30; E71/F16 xDrive35d (2010–2014) = N57D30; F16 xDrive40d (2014–2019) = N57D30B; G06 xDrive40d (2019–2022) = B57D30B (340 bhp); G06 LCI xDrive40d (2022–present) = B57D30B (352 bhp with MHEV). Tell us your registration date and we'll confirm it for free.

Yes — if caught early. A preventative timing chain, tensioner and guide replacement costs £1,500–£3,500 — one owner reported paying £1,800 for the work. However, if the chain snaps, a full engine replacement (£4,000–£7,500) is usually required. At the first sign of cold-start rattle, book an inspection immediately.

Disclaimer: All prices are indicative UK market ranges based on historical quote data from our network of engine specialists.
Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes.
Every engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty — always confirm terms with your chosen supplier.

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BMW X6 xDrive35d / 40d Engine Replacement —Compare Prices &Get Quotes

The X6 xDrive35d / 40d Through Time — Era Map

BMW X6 xDrive35d / 40d Engine Replacement Costs

Common Problems With BMW X6 xDrive35d / 40d Engines

1. Timing Chain Stretch & Failure(M57, N57, B57)

2. Piezo Injector Failure(N57 — E71, F16)

3. Turbocharger Oil Starvation & Failure(N57)

4. DPF & EGR System Issues(B57 — G06)

5. Connecting Rod Bearing & Crankshaft Issues(N57)

6. ZF 8HP Transmission Issues(All Generations)

1. Timing Chain Stretch & Failure(M57, N57, B57)

2. Piezo Injector Failure(N57 — E71, F16)

3. Turbocharger Oil Starvation & Failure(N57)

4. DPF & EGR System Issues(B57 — G06)

5. Connecting Rod Bearing & Crankshaft Issues(N57)

6. ZF 8HP Transmission Issues(All Generations)

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X6 xDrive35d / 40d — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This X6 xDrive35d / 40d? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW X6 xDrive35d / 40d Owners Trust BMWEngines.uk

Trusted X6 Diesel Engine Suppliers

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