How much does a BMW 6 Series 640d engine replacement cost in the UK?

A reconditioned N57 engine typically costs £4,500–£6,500 supply only for the pre‑LCI generation, with LCI units slightly higher. Fitting adds £1,200–£1,700. Use our calculator for a figure specific to your 640d.

Is the BMW 640d (N57) engine reliable?

It depends on how it has been maintained. The N57 is a powerful and refined engine, but it has known weaknesses - timing chain wear (particularly pre‑2015), main bearing issues, EGR clogging and oil leaks. With 5,000–8,000‑mile oil changes and preventative maintenance, it can be reliable; with 20,000‑mile BMW‑recommended intervals, it is a ticking time bomb.

What are the common problems with the BMW 640d engine?

Timing chain wear (pre‑2015 models), main bearing/crankshaft issues, EGR valve and cooler clogging, turbocharger failures, oil leaks (valve cover, oil filter housing, turbo lines), and fuel injector problems.

Is it worth replacing a 640d engine, or should I scrap the car?

Depends on vehicle value and condition. A 6 Series 640d is a £8,000–£25,000 vehicle - a £5,000–£6,000 recon is 20–75% of the car's value. For lower‑value examples (sub‑£10,000), replacement may exceed our 70% BMW scrap threshold. Evaluate carefully based on your car's generation, mileage and overall condition.

How do I find my BMW 640d engine code?

Listed on the VIN plate and vehicle documentation. The 640d engine code is N57D30T1. Pre‑2015 and LCI (2015+) versions share the same code but benefit from revised timing chain design in later cars. Tell us your registration date and we'll confirm it for free.

Can I prevent the common failures on a 640d?

Yes - the single most important prevention is 5,000–8,000‑mile oil changes with BMW LL‑04 5W30 or 5W40 oil. Avoid prolonged idling, use premium diesel to limit EGR deposits, and have the timing chain inspected at 100,000 miles. At the first sign of cold‑start rattle or knocking, book an inspection immediately.

BMW 6 Series 640d2011–2018N57D30T1

BMW 6 Series 640d Engine Replacement — Compare Prices & Get Quotes

The 640d packs BMW's 3.0-litre straight-six twin-turbo diesel (N57) - 313 hp and 630 Nm of torque across the F06, F12 and F13 generations. Get quotes from trusted UK specialists today.

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6 Series 640d Engines - from £2,500 to £7,500N57D30T1

6 Series 640d Engines - from £2,500 to £7,500· N57D30T1

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The 640d THROUGH TIME - Era Map

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

GenerationYearsEngine CodeReliabilityRecon CostEra Note

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 6 Series 640d Engine Replacement Costs

Supply Only£4,500–£6,500

Fitted (Indie)£5,800–£7,900

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,500–£4,000£3,700–£5,3001–6 monthsBudget priority; lower-mileage donor

Reconditioned Engine£4,500–£6,500£5,800–£7,90012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£5,500–£7,500£6,800–£8,90012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£8,000–£11,000£9,300–£12,70024–36 monthsInsurance jobs, warranty claims

Figures above reflect the range across both generations; LCI-era pricing runs slightly higher - see the Era Map above.

Labour estimate: Fitting a 640d engine typically takes 12–16 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). Engine oil capacity is 6.5 litres (5W‑30).

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Common Problems With BMW 320d Engines

1. Timing Chain Wear (Pre‑2015 Models)

Symptoms: Rattling noise on cold start, metallic ticking, delayed start, engine warning light, misfires.

Typical mileage: 60,000–100,000 miles

Repair cost: £1,500–£3,000 (chain, guides and tensioner replacement)

Replacement cost: N/A - repair only (if caught before chain snaps)

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

The N57's timing chain is prone to premature wear, particularly on pre‑2015 models. The chain, guides and tensioners weaken over time, causing excessive play and a metallic rattling when cold. If you hear a rattling noise on cold start, have the chain inspected immediately - ignoring it can lead to catastrophic engine damage. Many owners recommend replacing the chain preventatively around 100,000 miles. Regular oil changes every 5,000–8,000 miles are the single most effective prevention.

1. Timing Chain Wear (Pre‑2015 Models)

Symptoms: Rattling noise on cold start, metallic ticking, delayed start, engine warning light, misfires.

Typical mileage: 60,000–100,000 miles

Repair cost: £1,500–£3,000 (chain, guides and tensioner replacement)

Replacement cost: N/A - repair only (if caught before chain snaps)

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

2. EGR Valve and Cooler Clogging

Symptoms: Engine warning light, rough running, loss of power, coolant disappearing without visible leaks.

Typical mileage: 40,000–80,000 miles

Repair cost: £500–£1,200 (EGR cleaning or replacement)

Replacement cost: N/A - repair only

🟠 Check - book inspection urgently if symptoms appear

Our recommendation:

Carbon builds up in the EGR system over time, leading to performance dips and coolant leaks. This issue might seem minor at first, but a faulty EGR cooler can cause the engine to overheat - or even catch fire in extreme cases. If you notice any of these signs, have the system inspected immediately. Periodic cleaning of the EGR system every 40,000–60,000 miles is recommended.

3. Main Bearing / Crankshaft Issues

Symptoms: Knocking or rumbling noise from the engine, particularly when cold; metallic noises when hot.

Typical mileage: 80,000–120,000 miles

Repair cost: £4,000–£6,000 (bottom-end rebuild)

Replacement cost: £5,500–£7,500 (full engine replacement)

🔴 Immediate - if you hear knocking, stop driving and book an inspection today

Our recommendation:

The N57's main bearings are a known weakness - they are marginal compared to the older M57. Insufficient oil pressure at low RPM (often with no warning lights) can accelerate bearing wear. Frequent oil changes (5,000–8,000 miles max) are essential. Some owners also recommend replacing the connecting rod bearings preventively if mileage exceeds 120,000 miles. If you hear a knocking noise, do not drive the car - bottom-end failure is catastrophic.

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640d - 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.

640d - 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 SenseTiming chain wear✅ Yes£1,500–£3,000Catch it early - before chain snapsEGR valve/cooler clogging✅ Yes£500–£1,200Routine maintenance - clean or replaceMain bearing wear⚠️ Sometimes£4,000–£6,000Only if caught early - requires bottom‑end rebuildTurbocharger failure✅ Yes£1,500–£3,000Replace or rebuild - cheaper than collateral damageCrankshaft failure❌ Usually NoEngine replacementCatastrophic - full engine replacement required

Buying This 640d? Check These First

Buy If

Pre‑2015: timing chain replaced or inspected (or budget for it)
No cold‑start rattle - walk away if you hear anything unusual
Full service history with 5,000–8,000‑mile oil changes (not the 20,000‑mile BMW schedule)
No oil leaks (valve cover, oil filter housing, turbo lines)

Avoid If

Cold‑start rattle with no timing chain history - walk away
Knocking or rumbling from the engine - potential bearing failure
Poor service history - N57 engines are unforgiving of neglect
Engine warning light with no diagnosis - potentially expensive

Closing Verdict

The N57 is a powerful and refined straight‑six diesel that delivers effortless performance in the 6 Series. But it has known weaknesses - timing chain wear, main bearing issues, EGR clogging and oil leaks. The key to longevity is aggressive maintenance: 5,000–8,000‑mile oil changes, not the BMW‑recommended 20,000‑mile intervals. Buy on full service history, and if you're looking at a pre‑2015 car, budget for timing chain replacement. A well‑maintained 640d is a rewarding, long‑lived grand tourer; a neglected one is a £5,000+ bill waiting to happen.

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

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Buying Checklist

Before you buy a used BMW 6 Series 640d (or before you commit to an engine replacement), check these:

Cold Start

Listen for rattling or ticking; timing chain wear indicator

Knocking

Listen for knocking or rumbling; main bearing failure indicator

Service History

Check oil change intervals (5,000–8,000 miles ideal; 20,000 miles is a red flag)

Oil Leaks

Check under the car and around the engine; valve cover, filter housing and turbo lines are common leak points

EGR System

Check for engine warning light or rough running; EGR clogging is common

Turbo Health

Listen for whistling or whining; turbo failure indicator

Oil Consumption

Does it use more than 1L per 1,000 miles?

MOT History

Check for emissions‑related failures

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.

N57D30T1 (3.0 straight‑six twin‑turbo)

Years2011–2015

Power313 hp (230 kW) @ 4,400 rpm; 630 Nm @ 1,500–2,500 rpm

2025 Enquiries- (pattern data)

Avg. Recon Cost£4,500–£6,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

N57D30T1 (3.0 straight‑six twin‑turbo)2011–2015313 hp (230 kW) @ 4,400 rpm; 630 Nm @ 1,500–2,500 rpm- (pattern data)£4,500–£6,500 [PLACEHOLDER]

N57D30T1 (3.0 straight‑six twin‑turbo, revised)2015–2018313 hp (230 kW) @ 4,400 rpm; 630 Nm @ 1,500–2,500 rpm- (pattern data)£5,000–£7,000 [PLACEHOLDER]

Technical Specs

N57D30T1 3.0 straight‑six

Displacement2,993 cc

Cylinders6-cylinder inline

Compression Ratio16.5:1

Fuel SystemCommon-rail direct injection (2,000 bar)

TurbochargerTwin-turbo (Bi-Turbo) with variable geometry

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Market Intelligence

Most Common Failure

Pre‑2015: timing chain wear; EGR cooler clogging across all generations

Average Enquiry Mileage

70,000

–90,000 miles

Average Replacement Cost

£5,500

reconditioned, supply only

Most Requested Engine Code

N57D30T1

Peak Enquiry Season

Autumn/Winter

cold starts expose timing chain and bearing issues

Regional Demand

London18%

South East17%

North West12%

Regional Demand Breakdown

18%London

17%South East

12%North West

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 6 Series 640d engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence - from £2,500 for a used unit to £7,500 for a fully rebuilt straight‑six diesel.

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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