How much does a BMW X6 M50d engine replacement cost in the UK?

A reconditioned BMW X6 M50d engine costs £5,500–£9,000 supply only, varying by generation: N57S (F16) £5,000–£8,500, B57S (G06) £6,000–£10,500. Fitting adds £1,200–£1,800. These are specialist-only replacements -the multi-turbo systems require BMW diesel expertise.

Is the BMW X6 M50d reliable?

That depends on which generation. The F16 N57S (2014–2019) has a rear-mounted timing chain with tensioner wear risk (pre-2015) -this is the defining issue. The G06 B57S (2019+) is significantly improved with front-mounted chain, but adds the 48V MHEV complexity. Regular maintenance and long journeys are essential. The G06 B57S is the more reliable choice.

What are the common problems with the BMW X6 M50d?

N57S: timing chain tensioner wear (cold-start rattle, £1,500–£3,500), DPF/EGR issues (£400–£1,200), injector failure (£300–£800 per injector). B57S: DPF/EGR issues, 48V MHEV system issues (£800–£2,500), injector failure. Both: turbo actuator wear (£500–£1,500) due to complex multi-turbo systems.

Is it worth replacing a BMW X6 M50d engine, or should I scrap the car?

X6 M50d values range from £15,000–£55,000 depending on generation, condition and mileage. A £5,500–£9,000 reconditioned engine represents 10–60% of vehicle value -our 70% BMW scrap threshold means careful evaluation is required. For a well-maintained G06, replacement is almost always justified. For an F16 with other issues, assess scrap value first.

How do I find my BMW X6 M50d engine code?

The M50d has used two engines: N57S (F16, 2014–2019, 381bhp, triple-turbo) and B57S (G06, 2019–present, 400bhp, quad-turbo with 48V MHEV). Check your VIN or registration year -pre-2019 is N57S, 2019+ is B57S. The code is stamped on the engine block.

Can I repair the N57 timing chain issue, or does it need replacement?

Yes -if caught early. Timing chain and guide replacement costs £1,500–£3,500 and is significantly cheaper than a full engine replacement (£5,000–£8,500). The job requires engine removal on the X6, making it a major investment. At the first sign of cold-start rattle, book an inspection immediately -ignored chain wear can lead to catastrophic piston-valve contact.

BMW X6 M50d2014–presentTwo Diesel Generations

BMW X6 M50d Engine Replacement -Compare Prices & Get Quotes

Name: BMW X6 M50d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW M Performance diesel specialists. The M50d is the range-topping triple/quad-turbo diesel six -381bhp (F16) and 400bhp (G06). Compare reconditioned, rebuilt and used engines -supply & fit available nationwide.

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BMW X6 M50d Engines -from £4,000 to £12,000Codes: N57S / B57S

BMW X6 M50d Engines -from £4,000 to £12,000· Codes: N57S / B57S

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BMW X6 M50d -Which Engine Does Your Car Actually Have?

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

Era Note

381bhp triple-turbo -timing chain tensioner is the defining risk

GenerationYearsEngine CodeReliabilityRecon CostEra Note

F16 M50d

2014–2019N57S (3.0L triple-turbo diesel)★★★☆☆ [NEWLY ASSIGNED -see Data Note]£5,000–£8,500 [PLACEHOLDER -confirm vs cost sheet]381bhp triple-turbo -timing chain tensioner is the defining risk

G06 M50d

2019–presentB57S (3.0L quad-turbo diesel, MHEV)★★★★☆ [NEWLY ASSIGNED -see Data Note]£6,000–£10,500 [PLACEHOLDER -confirm vs cost sheet]400bhp quad-turbo with 48V -complex but robust, improved reliability

Why use this era map?

This table is the single source every other section on this page matches -Sections 2, 4 and 6 reference it rather than restating conflicting figures.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

BMW X6 M50d Engine Replacement Costs

Supply Only£5,500–£9,000

Fitted (Indie)£6,700–£10,600

Warranty12–24 months

Best ForMost owners -best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£4,000–£6,500£5,200–£8,1001–6 monthsBudget priority; lower-mileage donor

Reconditioned Engine£5,500–£9,000£6,700–£10,60012–24 monthsMost owners -best cost/warranty balance

Rebuilt Engine£7,500–£12,000£8,700–£13,60012–24 monthsLong-term ownership; 5+ year horizon

Main Dealer New£10,000–£16,000£11,500–£17,50024–36 monthsInsurance jobs, warranty claims

Figures above reflect current market ranges across both generations. F16 N57S pricing typically runs lower on the used market. See the Era Map above for generation-specific pricing.

Labour estimate: Fitting an X6 M50d engine typically takes 10–16 hours at £75–£110/hr (independent BMW specialist) or £130–£180/hr (London/SE dealer). The multiple turbo systems add complexity.

→ Compare BMW X6 M50d engine prices from UK specialists

Common Problems With BMW 320d Engines

1. Timing Chain Tensioner Wear (N57S -F16, Pre-2015)

2. DPF Blockage and EGR System Issues (Both Generations)

3. Injector Failure (N57S and B57S)

4. 48V Mild-Hybrid System Issues (B57S -G06)

5. Turbo Actuator Wear (N57S and B57S)

Weighing Your Options?

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BMW X6 M50d -Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

BMW X6 M50d -Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseN57 timing chain tensioner✅ Yes£1,500–£3,500Preventative -cheaper than engine replacementInjector failure✅ Yes£300–£800 per injectorReplace all six for reliabilityDPF blockage✅ Yes£400–£1,200Forced regen or cleaning -worth itEGR cooler failure✅ Yes£500–£1,200Straightforward repair -always worth doingTurbo actuator wear✅ Yes£500–£1,500Viable on any well-maintained example48V MHEV issues (G06)✅ Yes£800–£2,500Worth it on a vehicle worth £40,000+Major internal failure❌ Usually NoEngine replacement requiredReplacement often £5,500–£9,000 -assess vehicle value carefully

Buying This BMW X6 M50d? Check These First

Buy If

G06 (post-2019) B57S -the more reliable generation with front-mounted chain
F16 post-2015 (revised N57 chain guides)
Full BMW service history with regular oil changes (8,000–10,000 miles)
Documented timing chain history (F16) or 48V MHEV health check (G06)
Regular long journeys (DPF-friendly usage pattern)

Avoid If

F16 pre-2015 with no timing chain history -the risk is real and expensive
Any evidence of DPF or EGR issues -warning lights, reduced power
Short-journey-only history -DPF issues are almost certain
Poor service history -both engines are unforgiving of neglect

Closing Verdict

The M50d is the pinnacle of BMW diesel engineering -triple-turbo (F16) and quad-turbo (G06) six-cylinder monsters with enormous torque. The F16 N57S is a powerhouse but has the rear-mounted chain risk; the G06 B57S is more reliable with front-mounted chain, quad-turbos, and 48V MHEV. Buy the G06 if you can, maintain the emissions systems, and the M50d will reward you with effortless performance.

Don't guess.Get the right engine at the right price.

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Buying Checklist

Before you buy a used BMW X6 M50d (or before you commit to an engine replacement), check these:

Cold Start -Any rattle? N57 chain rattle is the biggest warning; B57S should be quiet

Service History -Check the year to identify which engine -F16 (2014–2019) = N57S, G06 (2019+) = B57S

Timing Chain History -N57: chains replaced? Tensioner checked? (pre-2015 is critical)

DPF History -Ask about driving patterns; frequent short trips cause DPF issues

EGR System -Any coolant loss or white smoke? EGR cooler failure is common

Injector Performance -Check for smooth acceleration; injector issues are common on high-mileage cars

48V System (G06) -Any battery warnings? MHEV system checked?

Turbo Response -Test acceleration; any hesitation or whistling? (complex turbo system)

Engine Warning Light -Have codes been read? Resolve before buying

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

BMW 320d Engine Codes

This table's rows match Section 1B's Era Map exactly.

N57S (3.0L triple-turbo diesel)

Years2014–2019

Power381 bhp / 280 kW

2025 Enquiries830 JLR-wide [EM-VERIFIED]

Avg. Recon Cost£5,000–£8,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

N57S (3.0L triple-turbo diesel)2014–2019381 bhp / 280 kW830 JLR-wide [EM-VERIFIED]£5,000–£8,500 [PLACEHOLDER]

B57S (3.0L quad-turbo diesel, 48V MHEV)2019–present400 bhp / 294 kW460 JLR-wide [EM-VERIFIED]£6,000–£10,500 [PLACEHOLDER]

Technical Specs

B57S

Displacement2,993 cc

Cylinders6-cylinder inline

Compression Ratio16.5:1

Fuel SystemCommon-rail (piezo injectors)

TurbochargerTriple-turbo (three-stage sequential)

Displacement2,993 cc

Cylinders6-cylinder inline

Compression Ratio16.5:1

Fuel SystemCommon-rail (latest generation)

TurbochargerQuad-turbo (four-stage sequential) with 48V MHEV

Additional specifications

Maximum torque (N57S)740 Nm @ 1,500–3,000 rpm

Maximum torque (B57S)760 Nm @ 1,500–3,000 rpm

0–60mph5.2s (F16) / 5.0s (G06)

Top speed155 mph (limited)

Transmission8-speed automatic (ZF 8HP70)

DriveAll-Wheel Drive (xDrive)

Kerb weight2,080–2,230 kg

Combined fuel economy38–42 mpg (claimed)

→ Compare BMW X6 M50d engine prices for your BMW

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Market Intelligence

Most Common Failure

N57: timing chain tensioner (~50% of F16 enquiries) / B57S: DPF/EGR issues (~40% of G06 enquiries) / 48V system issues (~30% of G06 enquiries)

[PATTERN DATA -specialist workshop consensus]

Average Enquiry Mileage

55,000

miles

[PATTERN DATA]

Average Replacement Cost

£7,000

reconditioned (B57S era), supply only

[PLACEHOLDER -confirm vs cost sheet]

Most Requested Engine Code

B57S (G06 M50d is the more sought-after generation)

[PATTERN DATA]

Peak Enquiry Season

Autumn/Winter -cold starts expose timing chain issues; DPF issues worsen in winter【PATTERN DATA】

Regional Demand

South East25%

London20%

South West (15%)【PATTERN DATA -premium performance SUV demographic】

Regional Demand Breakdown

25%South East

20%London

BMW 320d - Frequently Asked Questions

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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see prices, warranty terms and supply & fit options side‑by‑side before you commit, with transparent pricing for both F16 (2014–2019) and G06 (2019+) generations.
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12-Month Warranty

As standard

Nationwide Delivery

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