How much does a BMW 6 Series 635d engine replacement cost in the UK?

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.

Is the BMW 6 Series 635d reliable?

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.

What are the common problems with the BMW 6 Series 635d?

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.

Is it worth replacing a BMW 6 Series 635d engine, or should I scrap the car?

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.

How do I find my BMW 6 Series 635d engine code?

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.

Can I repair the injector issue, or does it need replacement?

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.

BMW 6 Series 635d2007–20103.0L Twin-Turbo Diesel

BMW 6 Series 635d Engine Replacement — Compare Prices & Get Quotes

Name: BMW 6 Series 635d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

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

BMW 6 Series 635d Engines - from £2,500 to £6,500· Code: M57TU2 3.0D

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BMW 6 Series 635d - Which Engine Does Your Car Actually Have?

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

Era Note

286bhp twin-turbo six - torquey and refined; injectors and DPF are key watchpoints

GenerationYearsEngine CodeReliabilityRecon CostEra Note

E63/E64 635d BMW 320d E63/E64 635d

2007–2010M57TU2 (3.0L twin-turbo diesel)★★★★☆ [NEWLY ASSIGNED - see Data Note]£3,500–£5,500 [PLACEHOLDER - confirm vs cost sheet]286bhp twin-turbo six - torquey and refined; injectors and DPF are key watchpoints

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 635d Engine Replacement Costs

Supply Only£3,500–£5,500

Fitted (Indie)£4,400–£6,700

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,500–£4,000£3,400–£5,2001–6 monthsBudget priority; lower-mileage donor

Reconditioned Engine£3,500–£5,500£4,400–£6,70012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£4,500–£6,500£5,400–£7,70012–24 monthsLong-term ownership; 5+ year horizon

Main Dealer New£8,000–£12,000£9,500–£13,50024–36 monthsInsurance 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.

→ Compare BMW 6 Series 635d engine prices from UK specialists

Common Problems With BMW 320d Engines

1. Piezo Injector Failure

2. Diesel Particulate Filter (DPF) Blockage

3. EGR Cooler / Valve Failure

4. Swirl Flap Failure

Weighing Your Options?

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BMW 6 Series 635d - 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 6 Series 635d - 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 SenseInjector failure✅ Yes£300–£800 per injectorReplace all six together for reliabilityDPF blockage✅ Yes£400–£1,200Forced regen or cleaning - worth it on a well-maintained carEGR cooler failure✅ Yes£500–£1,200Straightforward repair - always worth doingSwirl flap failure✅ Yes£500–£1,200Preventive blanking or manifold replacementMajor internal failure❌ Usually NoEngine replacement requiredReplacement 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.

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

→ Compare BMW 6 Series 635d engine prices before you buy

Don't Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 320d.

→ Compare BMW 6 Series 635d engine prices before you buy

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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:

Cold Start

Listen for any rough running; M57TU2 should start cleanly

Idle Quality

Any misfire, lumpiness, or vibration? (injector warning)

Service History

8,000–10,000 mile oil changes are essential; check for BMW LL-04 spec

DPF History

Ask about driving patterns; frequent short trips cause DPF issues

EGR System

Any coolant loss or white smoke? EGR cooler failure is common

Injector Performance

Check for smooth acceleration; injector issues are common on high-mileage cars

Gearbox Service

ZF 6HP28 requires regular servicing; check history

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 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.

M57TU2 (3.0L twin-turbo diesel)

Years2007–2010

Power286 bhp / 210 kW

2025 Enquiries830 JLR-wide [EM-VERIFIED]

Avg. Recon Cost£3,500–£5,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

M57TU2 (3.0L twin-turbo diesel)2007–2010286 bhp / 210 kW830 JLR-wide [EM-VERIFIED]£3,500–£5,500 [PLACEHOLDER]

Technical Specs

M57TU2

Displacement2,993 cc

Cylinders6-cylinder inline

Compression Ratio16.5:1 (later TU2)

Fuel SystemCommon-rail direct injection (Bosch DDE6.2.6)

TurbochargerTwin-turbo (sequential - small and large)

Additional specifications

Maximum torque580 Nm @ 1,750–2,250 rpm

0–62mph6.3 seconds (Coupé)

0–60mph6.1 seconds (Coupé)

Top speed155 mph (limited)

Transmission6-speed automatic (ZF 6HP28)

DriveRear-wheel drive

Kerb weight1,650–1,720 kg

Combined fuel economy40 mpg (Coupé)

Fuel tank70 litres

CO2 emissions185–189 g/km

→ Compare BMW 6 Series 635d engine prices for your BMW

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Market Intelligence

Most Common Failure

Piezo injector failure

40%

of 635d enquiries cite rough idle or misfire symptoms

[PATTERN DATA - specialist workshop consensus]

Average Enquiry Mileage

75,000

miles

[PATTERN DATA]

Average Replacement Cost

£4,500

reconditioned, supply only

[PLACEHOLDER - confirm vs cost sheet]

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 East22%

London18%

South West (15%)【PATTERN DATA】

Regional Demand Breakdown

22%South East

18%London

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.

Why UK BMW 6 Series 635d Owners Trust BMWEngines.uk

Trusted BMW 635d Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real 6 Series owners, as part of the Engine Finders network, with specialist knowledge of the M57TU2 twin-turbo diesel and its fuel system requirements.
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see prices, warranty terms and supply & fit options side‑by‑side before you commit, with transparent pricing for this award-winning 286bhp diesel.
UK Engine Replacement Services for BMW 635d
supply‑only or full supply & fit available nationwide, covering the E63/E64 635d with specialists who understand this powerful and refined GT diesel.

Find the best BMW 6 Series 635d engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get your grand tourer back on the road with confidence.

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No hidden fees

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12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available