BMW 6 Series 635d2007–20103.0L Twin-Turbo Diesel
BMW 6 Series 635d Engine Replacement —Compare Prices &
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Get quotes today from trusted UK BMW diesel specialists. The 635d is the torque-rich 3.0-litre twin-turbo M57 diesel — 286bhp and 580Nm of effortless grunt. Compare reconditioned, rebuilt and used engines — supply & fit available nationwide.
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BMW 6 Series 635d Engines — from £2,500 to £6,500Code: M57TU2 3.0D
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BMW 6 Series 635d — Which Engine Does Your Car Actually Have?
One generation. One era. One guide to reliability, costs and what really matters.
Era Note
286bhp twin-turbo six — torquey and refined; injectors and DPF are key watchpoints
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 6 Series 635d Engine Replacement Costs
- Supply Only£2,500 – £4,000
- Fitted (Indie)£3,400 – £5,200
- Warranty1–6 months
- Best ForBudget priority; lower-mileage donor
- Supply Only£3,500 – £5,500
- Fitted (Indie)£4,400 – £6,700
- Warranty12–24 months
- Best ForMost owners — best cost/warranty balance
- Supply Only£4,500 – £6,500
- Fitted (Indie)£5,400 – £7,700
- Warranty12–24 months
- Best ForLong-term ownership; 5+ year horizon
- Supply Only£8,000 – £12,000
- Fitted (Indie)£9,500 – £13,500
- Warranty24–36 months
- Best ForInsurance jobs, warranty claims
Figures above reflect the E63/E64 635d M57TU2 generation — a single-generation engine. Reconditioned units are available from around £2,650 upwards. All pricing is indicative; actual costs vary by mileage, condition and workshop location.
Labour estimate: Fitting a 6 Series 635d engine typically takes 10–14 hours at £70–£100/hr (independent BMW specialist) or £120–£170/hr (London/SE dealer). The 6 Series engine bay provides reasonable access, but the twin-turbo setup adds complexity.
Common Problems With BMW 6 Series 635d Engines
2. Diesel Particulate Filter (DPF) Blockage
3. EGR Cooler / Valve Failure
4. Swirl Flap Failure
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20+ vetted BMW specialists, covering the M57TU2 635d, with a 12-month warranty as standard.
6 Series 635d — 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 |
|---|---|---|---|
| Injector failure | Yes | £300 – £800 per injector | Replace all six together for reliability |
| DPF blockage | Yes | £400 – £1,200 | Forced regen or cleaning — worth it on a well-maintained car |
| EGR cooler failure | Yes | £500 – £1,200 | Straightforward repair — always worth doing |
| Swirl flap failure | Yes | £500 – £1,200 | Preventive blanking or manifold replacement |
| Major internal failure | Usually No | Engine replacement required | Replacement often £3,500–£5,500 — assess vehicle value carefully |
ProblemRepairable? · Typical Cost
Injector failure
Yes£300 – £800 per injector
Replace all six together for reliability
DPF blockage
Yes£400 – £1,200
Forced regen or cleaning — worth it on a well-maintained car
EGR cooler failure
Yes£500 – £1,200
Straightforward repair — always worth doing
Swirl flap failure
Yes£500 – £1,200
Preventive blanking or manifold replacement
Major internal failure
Usually NoEngine replacement required
Replacement often £3,500–£5,500 — assess vehicle value carefully
Buying This BMW 6 Series 635d? Check These First
Buy if:
- Full service history with regular oil changes (8,000–10,000 miles)
- Documented injector history — replacements or coding records
- DPF and EGR system checked — no warning lights or coolant loss
- Regular long journeys (DPF-friendly usage pattern)
- ZF 6HP28 gearbox service history (critical for longevity)
Avoid if:
- Any evidence of DPF or EGR issues — warning lights, reduced power
- Rough idle or misfire — injector problems are expensive
- Short-journey-only history — DPF issues are almost certain
- Poor service history — the M57 is unforgiving of extended oil changes
- Gearbox faults — the ZF 6HP can be expensive to rebuild
Closing verdict
The 635d is a remarkable grand tourer — 286bhp, 580Nm and effortless refinement. The M57TU2 is a powerful and characterful engine that won "Engine of the Year" for good reason. It's generally robust, but injectors, DPF and EGR systems demand attention. A well-maintained example with documented history and regular long journeys is a genuine classic in the making. Buy on history, maintain the fuel and emissions systems, and the 635d will reward you.
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Buying Checklist
Before you buy a used BMW 6 Series 635d (or before you commit to an engine replacement), check these:
1. Cold Start
Listen for any rough running; M57TU2 should start cleanly
2. Idle Quality
Any misfire, lumpiness, or vibration? (injector warning)
3. Service History
8,000–10,000 mile oil changes are essential; check for BMW LL-04 spec
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. Gearbox Service
ZF 6HP28 requires regular servicing; check history
8. Engine Warning Light
Have codes been read? DPF, EGR and injector codes are common
Buying Checklist
Before you buy a used BMW 6 Series 635d (or before you commit to an engine replacement), check these:
- 1
Cold Start
Listen for any rough running; M57TU2 should start cleanly
- 2
Idle Quality
Any misfire, lumpiness, or vibration? (injector warning)
- 3
Service History
8,000–10,000 mile oil changes are essential; check for BMW LL-04 spec
- 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
Gearbox Service
ZF 6HP28 requires regular servicing; check history
- 8
Engine Warning Light
Have codes been read? DPF, EGR and injector codes are common
Buy smart. Drive with confidence.
A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 6 Series 635d pitfalls.
Engine Codes
This table's rows match Section 1B's Era Map exactly.
M57TU2 (3.0L twin-turbo diesel)
- Years
- 2007–2010
- Power
- 286 bhp / 210 kW
- 2025 Enquiries
- 830 JLR-wide[EM-VERIFIED]
- Avg. Recon Cost
- £3,500–£5,500[PLACEHOLDER]
Technical SpecsM57TU2
- Displacement
- 2,993 cc
- Cylinders
- 6-cylinder inline
- Compression Ratio
- 16.5:1 (later TU2)
- Fuel System
- Common-rail direct injection (Bosch DDE6.2.6)
- Turbocharger
- Twin-turbo (sequential — small and large)
- Additional specifications
- Maximum torque
- 580 Nm @ 1,750–2,250 rpm
- 0–62mph
- 6.3 seconds (Coupé)
- 0–60mph
- 6.1 seconds (Coupé)
- Top speed
- 155 mph (limited)
- Transmission
- 6-speed automatic (ZF 6HP28)
- Drive
- Rear-wheel drive
- Kerb weight
- 1,650–1,720 kg
- Combined fuel economy
- 40 mpg (Coupé)
- Fuel tank
- 70 litres
- CO2 emissions
- 185–189 g/km
Market Intelligence
Real data from thousands of 6 Series 635d enquiries in 2025.
Most Common FailurePiezo injector failure
40%
of 635d enquiries cite rough idle or misfire symptoms
[PATTERN DATA]Average Enquiry Mileage
75,000
miles
[PATTERN DATA]Average Replacement Cost
£4,500
reconditioned, supply only
[PLACEHOLDER]Most Requested Engine Code
M57TU2
The 635d is a sought-after GT diesel variant
[PATTERN DATA]Peak Enquiry Season
Spring/Summer
GT car owners prepare for summer touring
[PATTERN DATA]Regional Demand
- South East
- 22%
- London
- 18%
- South West
- 15%
- Other Regions
- 45%
Regional Demand Breakdown
18%London22%South East15%South West45%Other Regions
Frequently Asked Questions
A reconditioned BMW 6 Series 635d engine (M57TU2) typically costs £3,500–£5,500 supply only. Fitting adds £1,000–£1,500. An injector replacement costs £300–£800 per injector. The M57TU2 is a premium diesel requiring specialist expertise.
The M57TU2 is generally robust and won "Engine of the Year" in 2007. However, piezo injectors can fail on higher-mileage examples, and DPF and EGR systems require monitoring — especially on cars used for short journeys. Regular maintenance and long journeys are essential. With proper care, these engines can cover 200,000+ miles.
Piezo injector failure (rough idle, misfire, £300–£800 per injector), DPF blockage (warning light, reduced power, £400–£1,200), EGR cooler failure (coolant loss, white smoke, £500–£1,200), and swirl flap failure (loss of power, £500–£1,200). The ZF 6HP28 gearbox also requires regular servicing.
6 Series 635d values range from £5,000–£15,000 depending on condition and mileage. A £3,500–£5,500 reconditioned engine represents 25–80% of vehicle value — our 70% BMW scrap threshold means careful evaluation is required. For a well-maintained, low-mileage example, replacement is often justified. For a higher-mileage example with other issues, assess scrap value first. An injector replacement (£1,800–£3,000 for all six) is almost always worth fixing.
The 635d uses a single engine code: M57TU2 (also referred to as M57D30TU2 or M57N2). This is BMW's 3.0-litre twin-turbo diesel, producing 286bhp. The code is stamped on the engine block; your VIN and vehicle documentation will also confirm the specification.
Yes — injectors can be exchanged or replaced (£300–£800 per injector). Symptoms include rough idle, misfire, and poor acceleration. New injectors must be coded to the DDE (engine ECU). Replacing all six together is recommended as they degrade at similar rates. At the first sign of rough idle, book an inspection — ignored injector problems can lead to cylinder wash and engine damage.
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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