BMW 6 Series 640d2011–2018N57D30T1

BMW 6 Series 640d Engine Replacement —Compare Prices &
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Name: BMW 6 Series 640d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

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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Supply &Fit Available
12-MonthWarranty
NationwideDelivery
20+Specialists

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

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Reconditioned
Rebuilt
Used
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Instant Quotes
No Obligation
100% Free
Reconditioned
Rebuilt
Used
Supply & Fit Available
UK-Wide Network

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 Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£2,500 – £4,000	£3,700 – £5,300	1–6 months	Budget priority; lower-mileage donor
Reconditioned Engine	£4,500 – £6,500	£5,800 – £7,900	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£5,500 – £7,500	£6,800 – £8,900	12–24 months	Long-term ownership; 3+ year horizon
Main Dealer New	£8,000 – £11,000	£9,300 – £12,700	24–36 months	Insurance 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 6 Series 640d 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)
Urgency: 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)
Urgency: 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
Urgency: 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)
Urgency: 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?

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 wear	Yes	£1,500 – £3,000	Catch it early — before chain snaps
EGR valve/cooler clogging	Yes	£500 – £1,200	Routine maintenance — clean or replace
Main bearing wear	Sometimes	£4,000 – £6,000	Only if caught early — requires bottom‑end rebuild
Turbocharger failure	Yes	£1,500 – £3,000	Replace or rebuild — cheaper than collateral damage
Crankshaft failure	Usually No	Engine replacement	Catastrophic — full engine replacement required

ProblemRepairable? · Typical Cost

Timing chain wear

Yes£1,500 – £3,000

Catch it early — before chain snaps

EGR valve/cooler clogging

Yes£500 – £1,200

Routine maintenance — clean or replace

Main bearing wear

Sometimes£4,000 – £6,000

Only if caught early — requires bottom‑end rebuild

Turbocharger failure

Yes£1,500 – £3,000

Replace or rebuild — cheaper than collateral damage

Crankshaft failure

Usually NoEngine replacement

Catastrophic — 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.

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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:

1. Cold Start
Listen for rattling or ticking; timing chain wear indicator
2. Knocking
Listen for knocking or rumbling; main bearing failure indicator
3. Service History
Check oil change intervals (5,000–8,000 miles ideal; 20,000 miles is a red flag)
4. Oil Leaks
Check under the car and around the engine; valve cover, filter housing and turbo lines are common leak points
5. EGR System
Check for engine warning light or rough running; EGR clogging is common
6. Turbo Health
Listen for whistling or whining; turbo failure indicator
7. Oil Consumption
Does it use more than 1L per 1,000 miles?
8. MOT History
Check for emissions‑related failures

Why this matters

A 10-minute check now can save you thousands later. The right 6 Series 640d is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

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

1
Cold Start
Listen for rattling or ticking; timing chain wear indicator
2
Knocking
Listen for knocking or rumbling; main bearing failure indicator
3
Service History
Check oil change intervals (5,000–8,000 miles ideal; 20,000 miles is a red flag)
4
Oil Leaks
Check under the car and around the engine; valve cover, filter housing and turbo lines are common leak points
5
EGR System
Check for engine warning light or rough running; EGR clogging is common
6
Turbo Health
Listen for whistling or whining; turbo failure indicator
7
Oil Consumption
Does it use more than 1L per 1,000 miles?
8
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 6 Series 640d pitfalls.

Engine Codes

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

N57D30T1 (3.0 straight‑six twin‑turbo)

Years: 2011–2015
Power: 313 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 Code	Years	Power	2025 Enquiries	Avg. Recon Cost
N57D30T1 (3.0 straight‑six twin‑turbo)	2011–2015	313 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)	2015–2018	313 hp (230 kW) @ 4,400 rpm; 630 Nm @ 1,500–2,500 rpm	—(pattern data)	£5,000–£7,000[PLACEHOLDER]

Technical SpecsN57D30T1 3.0 straight‑six

Displacement: 2,993 cc
Cylinders: 6-cylinder inline
Compression Ratio: 16.5:1
Fuel System: Common-rail direct injection (2,000 bar)
Turbocharger: Twin-turbo (Bi-Turbo) with variable geometry

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Market Intelligence

Real data from thousands of 6 Series 640d enquiries in 2025.

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

London: 18%
South East: 17%
North West: 12%
Other Regions: 53%

Regional Demand Breakdown

18%London17%South East12%North West53%Other Regions

Frequently Asked Questions

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.

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.

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.

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.

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.

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.

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

BMW 6 Series 640d Engine Replacement Costs

Common Problems With BMW 6 Series 640d Engines

1. Timing Chain Wear(Pre‑2015 Models)

2. EGR Valve and Cooler Clogging

3. Main Bearing / Crankshaft Issues

1. Timing Chain Wear(Pre‑2015 Models)

2. EGR Valve and Cooler Clogging

3. Main Bearing / Crankshaft Issues

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640d — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This 640d? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 6 Series 640d Owners Trust BMWEngines.uk

BMW 6 Series 640d Engine Replacement —Compare Prices &
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