How much does a BMW M550d engine replacement cost in the UK?

A reconditioned M550d engine typically costs £6,000–£10,000 supply only for the F10 N57S, or £8,000–£14,000 for the G30 B57. Fitting adds £1,500–£2,500. Main dealer new engines can exceed £28,000. Use our calculator for a figure specific to your car.

Is the BMW M550d engine reliable?

It depends on the generation. The N57S (F10) is rated ★★★☆☆ - high maintenance, with timing chain, turbo, and oil pump issues well-documented. The B57 (G30) is rated ★★★★☆ - more reliable, with front-mounted chain and improved cooling, but still a complex engine requiring specialist maintenance. These are high-performance diesel engines - expect higher running costs.

What are the common problems with the BMW M550d?

N57S triple-turbo wear, N57S timing chain and oil pump issues, B57 quad-turbo management issues, and oil dilution from DPF regeneration affecting both engines. The B57 is significantly more reliable than the N57S, but both demand specialist care.

Is it worth replacing a BMW M550d engine, or should I scrap the car?

Depends on vehicle value and generation. Against a well-kept F10 M550d worth £12,000–£18,000, an £8,000 recon is 44–67% of the car's value - assess carefully. For a G30 worth £20,000+, the same recon is 40% - more justifiable. Always assess the rest of the car before committing.

How do I find my BMW M550d engine code?

Listed on the VIN plate and vehicle documentation. As a rule of thumb: F10 (2012–2017) is N57S triple-turbo, G30 (2017+) is B57 quad-turbo. Tell us your registration date and we'll confirm it for free.

Can I repair the N57S timing chain, or does it need replacement?

Yes - if caught early. A preventative chain replacement (£1,500–£3,000) is far cheaper than a catastrophic chain snap (£6,000–£10,000 engine replacement). At the first sign of cold-start rattle, book an inspection immediately. Also check oil pressure - N57 oil pump failure can be equally catastrophic.

BMW 5 Series M550d2012–present2 Generations

BMW 5 Series M550d Engine Replacement — Compare Prices & Get Quotes

Get quotes today from trusted UK BMW M550d specialists. Compare reconditioned, rebuilt and used N57S and B57 engines for the ultimate performance diesel - supply & fit available nationwide.

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BMW M550d Engines - from £4,500 to £14,000Common codes: N57S, B57

BMW M550d Engines - from £4,500 to £14,000· Common codes: N57S, B57

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The M550d THROUGH TIME - Era Map

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

Era Note

The original M550d - tri-turbo marvel. Complex, high-maintenance; chain, turbo, and oil pump are watchpoints.

GenerationYearsEngine CodeReliabilityRecon CostEra Note

F10 / F11

2012–2017N57S (triple-turbo 3.0 diesel)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£6,000–£10,000 [PLACEHOLDER - confirm vs cost sheet]The original M550d - tri-turbo marvel. Complex, high-maintenance; chain, turbo, and oil pump are watchpoints.

G30 / G31

2017–presentB57 (quad-turbo 3.0 diesel)★★★★☆ [NEWLY ASSIGNED - see Data Note]£8,000–£14,000 [PLACEHOLDER - confirm vs cost sheet]The modern M550d - quad-turbo with 48V mild-hybrid. More reliable but still extremely complex; cooling system and turbo management are key.

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 UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

BMW 5 Series M550d Engine Replacement Costs

Supply Only£6,000–£10,000

Fitted (Indie)£7,200–£11,500

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£4,500–£7,500£5,600–£8,9003–6 monthsBudget priority; vehicle under £15,000

Reconditioned Engine£6,000–£10,000£7,200–£11,50012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£8,000–£14,000£9,200–£15,50012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£20,000–£28,000£22,500–£31,00024–36 monthsInsurance jobs, warranty claims; dealer costs can exceed £28,000

Labour estimate: Fitting an M550d engine typically takes 16–24 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). The complex turbo systems require specialist knowledge.

Common Problems With BMW 320d Engines

Weighing Your Options?

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BMW M550d - 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 M550d - 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 SenseN57S triple-turbo wear (F10)✅ Yes£2,000–£5,000Specialist turbo refurbishment or replacement; don't ignore boost issuesN57S timing chain wear (F10)✅ Yes£1,500–£3,000Preventative - catches the fault before it becomes catastrophicN57S oil pump failure (F10)✅ Yes£800–£1,500Replace pump and chain together; don't ignore low oil pressureB57 quad-turbo management issues (G30)✅ Yes£1,500–£4,000Sensor, actuator, or cooling system repairs; specialist requiredB57 cooling system failure (G30)✅ Yes£500–£1,200Preventative - replace water pump at 60,000 milesSnapped timing chain (N57S)❌ Usually NoEngine replacementPiston-valve contact means little is left to repair

Buying This M550d? Check These First

Buy If

G30 B57 (2017+) if you want the more reliable quad-turbo with front-mounted chain
Documented turbocharger history if buying a F10 N57S triple-turbo
Evidence of frequent oil changes (every 5,000–7,000 miles) - these engines demand it
Full BMW service history with specialist M-performance diesel experience

Avoid If

F10 N57S with cold-start rattle and no chain history
Any turbo noise or loss of power without diagnosis
No evidence of DPF maintenance - oil dilution is a real risk
Poor service history on any generation - the M550d is unforgiving of neglect

Closing Verdict

The M550d is a remarkable achievement - a triple- or quad-turbo diesel that delivers near-supercar performance. But complexity comes at a cost. The F10 N57S is the more problematic of the two, with well-documented chain, turbo, and oil pump issues. The G30 B57 is more reliable but still demands specialist care. Buy on documented history, and always budget for higher-than-normal maintenance costs.

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Buying Checklist

Before you buy a used BMW M550d (or before you commit to an engine replacement), check these:

Cold Start

Listen for rattle on startup (timing chain warning on N57S; check for B57 turbo issues)

Service History

Including which engine era (N57S for F10 2012–2017, B57 for G30 2017+) - see the Era Map above

Turbo Health

Test acceleration through the rev range; any lag, whistling, or uneven power delivery?

Oil Pressure

Any low oil pressure warnings? Oil pump issues are a known risk on N57S

Oil Level

Is the oil above the max mark? Diesel contamination from DPF regeneration indicator

DPF Regeneration

Has the vehicle had regular motorway runs? Short journeys accelerate DPF issues

Engine Warning Light

Have codes been read? Any unresolved issues?

MOT History

Check for emissions-related failures; often point to DPF or turbo problems

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

N57S (triple-turbo)

Years2012–2017

Power381 bhp / 740 Nm

2025 Enquiries- (pattern data)

Avg. Recon Cost£6,000–£10,000 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

N57S (triple-turbo)2012–2017381 bhp / 740 Nm- (pattern data)£6,000–£10,000 [PLACEHOLDER]

B57 (quad-turbo)2017–present394 bhp / 760 Nm- (pattern data)£8,000–£14,000 [PLACEHOLDER]

Technical Specs

current B57 quad-turbo

Displacement2,993cc

Cylinders6-cylinder inline

Compression Ratio16.5:1

Fuel SystemCommon-rail direct injection

TurbochargerQuad-turbo (two low-pressure, two high-pressure in staged arrangement)

Market Intelligence

Most Common Failure

N57S triple-turbo system wear and timing chain

60%

of N57S enquiries

[PATTERN DATA]

Average Enquiry Mileage

75,000

miles

[PATTERN DATA]

Average Replacement Cost

£8,000

reconditioned, supply only

[PLACEHOLDER - confirm vs cost sheet]

Most Requested Engine Code

N57S

[BMW-VERIFIED]

Peak Enquiry Season

Winter

cold starts expose chain and turbo issues

[PATTERN DATA]

Regional Demand

London22%

South East18%

South West14%

PATTERN DATA

Regional Demand Breakdown

22%London

18%South East

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.

Find the best BMW M550d engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and keep your high-performance diesel on the road.

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100% Free

No hidden fees

No Obligation

Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available