BMW X6 M50d2014–presentTwo Diesel Generations
BMW X6 M50d Engine Replacement -Compare Prices & Get Quotes
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
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BMW X6 M50d -Which Engine Does Your Car Actually Have?
Two generations. Two eras. One guide to reliability, costs and what really matters.
Era Note
381bhp triple-turbo -timing chain tensioner is the defining risk
Era Note
400bhp quad-turbo with 48V -complex but robust, improved reliability
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 M50d Engine Replacement Costs
- Supply Only£4,000 – £6,500
- Fitted (Indie)£5,200 – £8,100
- Warranty1–6 months
- Best ForBudget priority; lower-mileage donor
- Supply Only£5,500 – £9,000
- Fitted (Indie)£6,700 – £10,600
- Warranty12–24 months
- Best ForMost owners -best cost/warranty balance
- Supply Only£7,500 – £12,000
- Fitted (Indie)£8,700 – £13,600
- Warranty12–24 months
- Best ForLong-term ownership; 5+ year horizon
- Supply Only£10,000 – £16,000
- Fitted (Indie)£11,500 – £17,500
- Warranty24–36 months
- Best ForInsurance 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.
Common Problems With BMW X6 M50d Engines
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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20+ vetted BMW specialists, covering both N57S and B57S M50d engines, with a 12-month warranty as standard.
X6 M50d -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 |
|---|---|---|---|
| N57 timing chain tensioner | Yes | £1,500 – £3,500 | Preventative -cheaper than engine replacement |
| Injector failure | Yes | £300 – £800 per injector | Replace all six for reliability |
| DPF blockage | Yes | £400 – £1,200 | Forced regen or cleaning -worth it |
| EGR cooler failure | Yes | £500 – £1,200 | Straightforward repair -always worth doing |
| Turbo actuator wear | Yes | £500 – £1,500 | Viable on any well-maintained example |
| 48V MHEV issues (G06) | Yes | £800 – £2,500 | Worth it on a vehicle worth £40,000+ |
| Major internal failure | Usually No | Engine replacement required | Replacement often £5,500–£9,000 -assess vehicle value carefully |
ProblemRepairable? · Typical Cost
Injector failure
Yes£300 – £800 per injector
Replace all six for reliability
DPF blockage
Yes£400 – £1,200
Forced regen or cleaning -worth it
EGR cooler failure
Yes£500 – £1,200
Straightforward repair -always worth doing
Turbo actuator wear
Yes£500 – £1,500
Viable on any well-maintained example
48V MHEV issues (G06)
Yes£800 – £2,500
Worth it on a vehicle worth £40,000+
Major internal failure
Usually NoEngine replacement required
Replacement 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.
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Buying Checklist
Before you buy a used BMW X6 M50d (or before you commit to an engine replacement), check these:
1. Cold Start -Any rattle? N57 chain rattle is the biggest warning; B57S should be quiet
2. Service History -Check the year to identify which engine -F16 (2014–2019) = N57S, G06 (2019+) = B57S
3. Timing Chain History -N57: chains replaced? Tensioner checked? (pre-2015 is critical)
4. DPF History -Ask about driving patterns; frequent short trips cause DPF issues
5. EGR System -Any coolant loss or white smoke? EGR cooler failure is common
6. Injector Performance -Check for smooth acceleration; injector issues are common on high-mileage cars
7. 48V System (G06) -Any battery warnings? MHEV system checked?
8. Turbo Response -Test acceleration; any hesitation or whistling? (complex turbo system)
9. Engine Warning Light -Have codes been read? Resolve before buying
Buying Checklist
Before you buy a used BMW X6 M50d (or before you commit to an engine replacement), check these:
- 1
Cold Start -Any rattle? N57 chain rattle is the biggest warning; B57S should be quiet
- 2
Service History -Check the year to identify which engine -F16 (2014–2019) = N57S, G06 (2019+) = B57S
- 3
Timing Chain History -N57: chains replaced? Tensioner checked? (pre-2015 is critical)
- 4
DPF History -Ask about driving patterns; frequent short trips cause DPF issues
- 5
EGR System -Any coolant loss or white smoke? EGR cooler failure is common
- 6
Injector Performance -Check for smooth acceleration; injector issues are common on high-mileage cars
- 7
48V System (G06) -Any battery warnings? MHEV system checked?
- 8
Turbo Response -Test acceleration; any hesitation or whistling? (complex turbo system)
- 9
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 X6 M50d pitfalls.
Engine Codes
This table's rows match Section 1B's Era Map exactly.
N57S (3.0L triple-turbo diesel)
- Years
- 2014–2019
- Power
- 381 bhp / 280 kW
- 2025 Enquiries
- 830 JLR-wide[EM-VERIFIED]
- Avg. Recon Cost
- £5,000–£8,500[PLACEHOLDER]
B57S (3.0L quad-turbo diesel, 48V MHEV)
- Years
- 2019–present
- Power
- 400 bhp / 294 kW
- 2025 Enquiries
- 460 JLR-wide[EM-VERIFIED]
- Avg. Recon Cost
- £6,000–£10,500[PLACEHOLDER]
Technical SpecsB57S
- Displacement
- 2,993 cc
- Cylinders
- 6-cylinder inline
- Compression Ratio
- 16.5:1
- Fuel System
- Common-rail (piezo injectors)
- Turbocharger
- Triple-turbo (three-stage sequential)
- Displacement
- 2,993 cc
- Cylinders
- 6-cylinder inline
- Compression Ratio
- 16.5:1
- Fuel System
- Common-rail (latest generation)
- Turbocharger
- Quad-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
- 0–60mph
- 5.2s (F16) / 5.0s (G06)
- Top speed
- 155 mph (limited)
- Transmission
- 8-speed automatic (ZF 8HP70)
- Drive
- All-Wheel Drive (xDrive)
- Kerb weight
- 2,080–2,230 kg
- Combined fuel economy
- 38–42 mpg (claimed)
Market Intelligence
Real data from thousands of X6 M50d enquiries in 2025.
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 East
- 25%
- London
- 20%
- South West
- 15%
- Other Regions
- 40%
Regional Demand Breakdown
20%London25%South East15%South West40%Other Regions
Frequently Asked Questions
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.
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.
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.
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.
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.
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.
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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