6 Series Diesel Engines
from £2,300 to £3,430
Rebuilt units from £2,300 · Common codes: N57D30, B57D30, M57D30, B47D20
BMW ENGINE MARKETPLACE
BMW 6 Series N57/B57/B58 Specialist Engine Replacement - Compare Quotes
Get specialist quotes from UK BMW 6 Series engine experts. Compare reconditioned & rebuilt engines for 620d to M6 - N57/B57/B58 covered. Find UK performance engine specialists.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
6 Series Petrol Engines
from £4,820 to £6,200
Rebuilt units from £4,820 · Common codes: N55B30, B58B30, N52B30, B48B20
6 Series V8 & M6 Engines
from £3,230 to £10,870
Rebuilt units from £3,230 · Common codes: N63B44, S63B44, S85B50, N62B48
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Compare reconditioned, rebuilt & used engine prices
Supply & fit available - parts and labour from vetted specialistsInstant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialistsHow It Works
3 Simple Steps3 Simple Stepsto Finding the Best BMW 6 Series Replacement Engineto Finding the Best BMW 6 Series Replacement Engine
12-Month Warranty
Supply & Fit Available
Nationwide Delivery
Trusted UK Suppliers
Most replacements completed within 3-5 days.
Live UK Engine Market Data
What Are UK Drivers Paying for BMW 6 Series Engine Replacement
Typical UK rebuilt engine costs for BMW 6 Series variants by failure cause, chassis code, engine code and fuel type based on verified market data.
Average Market Prices
↻ Last updated: 4 Aug 26, 9:26
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Variants We Cover
BMW 6 Series Engine ReplacementAll Variants Covered
6 Series M6
S63B44 4.4L Twin-Turbo V8 4.4L Twin
Rebuilt Engines: £10,870-£14,500
6 Series M6 (E63)
S85B50 5.0L V10 5.0L V
Rebuilt Engines: £4,650-£7,500
Not sure which variant your BMW 6 Series is- Enter your registration number above - we'll identify the exact sub-model, engine code and compatible replacement options instantly.
6 Series
Engine Codes
BMW 6 Series Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the BMW 6 Series across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.
Diesel Engines
Extracted from detailed diesel engine families across BMW 6 Series variants.
N57D30 - 3.0 Litre Diesel
Main replacement triggers are timing chain wear, EGR / cooling faults and turbo-control issues.
Compatible variants
640d640d M Sport640d xDrive640d xDrive M Sport640d Gran Coupe640d Convertible
Avg. rebuilt price
£2,450 - £3,430
Supply only
Technical specifications
- Fuel type
- Diesel
- Engine size
- 3.0L
- Power output
- 306-313 hp
- Years fitted
- 2011-2018
Common failures
- ●Main replacement triggers are timing chain wear, EGR / cooling faults and turbo-control issues.
- ●Confirm exact engine code and fitment before ordering.
- ●Ask for warranty and supply & fit terms.
Not sure which engine code?
Can’t find your engine code- Enter your registration number above - we’ll instantly identify the exact unit, its technical specifications, and live replacement prices from UK BMW 6 Series engine specialists. Every rebuilt engine comes with a minimum 12-month unlimited mileage warranty.
6 Series
Common Problems
BMW 6 Series Engine Problems - What It Costs to Fix & When Replacement Makes Sense
The BMW 6 Series delivers refined grand touring capability, but its reliance on complex N57 twin-turbo diesels, thermally stressed N63/N62 V8 petrols, and high-revving S-series performance units means specific failure patterns dominate UK replacement enquiries. Timing chain degradation on early N57 diesels, turbo cooling system stress on N63 V8s, and oil...
BMW 6 Series Timing Chain Failure - Why N57 Diesel Engines Fail Prematurely
BMW 6 Series Timing Chain Failure
Most affected vehicles
BMW 6 Series 640d640d xDrive
BMW 6 Series 640d, 640d xDrive, 640d Gran Coupe (2011-2015, N57D30A & N57D30B)
Failure mileage range
70,000 - 100,000 miles
Typical failure window
Root cause
The rear-mounted timing chain tensioner relies on consistent oil pressure and degrades prematurely under sustained load, allowing the duplex chain to stretch and eventually jump timing or snap, which frequently destroys the valvetrain.
Repair options & estimated costs (UK ranges)
| Repair tier | Dealer price | Specialist price | What it involves | Longevity / suitability |
|---|---|---|---|---|
| Minor - Preventative Chain & Tensioner Replacement | £1,800 - £2,500 | £950 - £1,400 | Removal of engine ancillaries, installation of upgraded tensioner, chain guides, and rails | Only viable before catastrophic damage occurs; requires immediate attention if rattling is detected |
| Intermediate - Valvetrain & Chain Overhaul | £3,200 - £4,800 | £1,800 - £2,600 | Full chain kit replacement, cylinder head inspection, valve and camshaft replacement if damaged | Restores original function but leaves aged block and turbo systems in place |
| Full Replacement - Rebuilt / Reconditioned BMW 6 Series N57 Engine | £5,500 - £7,200 | £3,400 - £4,200 | Supply & fit of fully stripped engine with upgraded timing tensioner, new injectors, turbos, and complete gasket set | Longest-lasting solution; 12-month unlimited mileage warranty covers all replaced components |
Our recommendation
On a BMW 6 Series valued at £8,000-£15,000, we strongly advise the full replacement route if the timing chain has already jumped or snapped. Preventative chain kits are cost-effective only if caught during early-stage rattle diagnostics; once metal debris circulates through the oil galleries, a rebuilt N57 unit with reinforced tensioners offers significantly better long-term value and reliability.
Compare rebuilt N57 BMW 6 Series engine prices for your exact variantReplacement Engine Options
BMW 6 Series Engine TypesOptions, Costs & What to Expect
Every engine type is available through our UK specialist network, with typical price ranges determined by your exact variant, engine code and budget requirements.
BMW 6 Series Reconditioned Engines (Recon)£2,800 - £5,200((supply only))
BMW 6 Series Rebuilt Engines£3,400 - £6,800((supply only))
BMW 6 Series Used Engines£1,800 - £4,500((supply only))
BMW 6 Series Remanufactured Engines£5,500 - £9,500((supply only))
BMW 6 Series Refurbished Engines£2,200 - £4,800((supply only))
Compare BMW 6 Series engine prices with vetted UK suppliers
All engine types include a minimum 12-month unlimited mileage warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific BMW 6 Series within hours.
Engine Sizes
BMW 6 Series Engines by SizeFind the Right Displacement for Your Variant
Every displacement fitted to the BMW 6 Series across all UK generations is detailed below, complete with compatible engine codes, production years and verified common failure notes.
Introduced exclusively on the G32 Gran Turismo generation, this efficient four-cylinder unit serves as the entry-level diesel option, featuring TwinPower Turbo technology and 48-volt mild-hybrid readiness to optimise real-world fuel economy. It replaces older larger units for urban compliance while maintaining adequate torque for grand touring duties.
⚙
Engine Code(s)
B47D20A
▣
Compatible Models (UK)
620d Gran Turismo (G32, 2017-2023), 620d M Sport
ϟ
Power output
Verified by registration
△
Common Failure Points
EGR cooler internal leakage, swirl flap motor failure, turbocharger actuator wear
Production Years: G32, 2017-2023
Get quotes for BMW 6 Series 2.0L diesel enginesBMW 6 Series Engines Fuel Type
BMW 6 Series Engines by Fuel Type
Choose your BMW 6 Series engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from early E63 N57 diesel to the latest G32 B58 petrol with mild hybrid support.
BMW 6 Series Diesel Engines
DieselDiesel power defined the 6 Series grand touring ethos across E63, F-generation and G32 Gran Turismo, with twin-turbo inline-six units delivering strong torque and motorway efficiency for long-distance UK drivers.
Common BMW 6 Series Diesel Engine Families
- •M57D30 - E63 635d twin-turbo diesel, robust but swirl flap concerns pre-2007
- •N57D30 - F06/F12/F13 640d workhorse, timing chain tensioner wear at higher mileage
- •B57D30 - G32 630d Gran Turismo, Euro 6d compliant with 48V mild hybrid readiness
Found In
- •E63/E64 Coupe/Convertible (2004-2010) - M57D30
- •F06 Gran Coupe/F12 Convertible/F13 Coupe (2011-2018) - N57D30A/B
- •G32 Gran Turismo (2017-2023) - B47D20A, B57D30A/C
Known For
- •Exceptional motorway fuel economy and refined torque delivery for grand touring
- •N57 rear timing chain tensioner failures between 70k-100k miles on pre-2015 units
- •DPF regeneration issues on short-journey urban driving patterns
Typical Diesel Models
- •635d (E63/E64)
- •640d, 640d xDrive (F06/F12/F13)
- •620d Gran Turismo (G32)
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BMW 6 Series Diesel Engines
DieselDiesel power defined the 6 Series grand touring ethos across E63, F-generation and G32 Gran Turismo, with twin-turbo inline-six units delivering strong torque and motorway efficiency for long-distance UK drivers.
Common BMW 6 Series Diesel Engine Families
- •M57D30 - E63 635d twin-turbo diesel, robust but swirl flap concerns pre-2007
- •N57D30 - F06/F12/F13 640d workhorse, timing chain tensioner wear at higher mileage
- •B57D30 - G32 630d Gran Turismo, Euro 6d compliant with 48V mild hybrid readiness
Found In
- •E63/E64 Coupe/Convertible (2004-2010) - M57D30
- •F06 Gran Coupe/F12 Convertible/F13 Coupe (2011-2018) - N57D30A/B
- •G32 Gran Turismo (2017-2023) - B47D20A, B57D30A/C
Known For
- •Exceptional motorway fuel economy and refined torque delivery for grand touring
- •N57 rear timing chain tensioner failures between 70k-100k miles on pre-2015 units
- •DPF regeneration issues on short-journey urban driving patterns
Typical Diesel Models
- •635d (E63/E64)
- •640d, 640d xDrive (F06/F12/F13)
- •620d Gran Turismo (G32)
BMW 6 Series Petrol Engines
PetrolPetrol variants span naturally aspirated inline-six and V8 units through to modern turbocharged B58 performance, offering smooth refinement and responsive power across all three UK generations.
Common BMW 6 Series Petrol Engine Families
- •N52B30 - E63 630i naturally aspirated inline-six, valvetronic and water pump wear points
- •N55B30 - F-generation 640i single twin-scroll turbo, wastegate rattle and charge pipe cracks
- •B58B30 - G32 640i Gran Turismo, improved reliability with closed-deck block design
Found In
- •E63/E64 Coupe/Convertible (2004-2010) - N52B30, N62B44/B48, S85B50
- •F06 Gran Coupe/F12 Convertible/F13 Coupe (2011-2018) - N55B30, N63B44A/B, S63B44
- •G32 Gran Turismo (2017-2023) - B48B20B, B58B30A
Known For
- •Silky smooth power delivery and refined high-speed cruising character
- •N63 early-generation thermal stress causing valve stem seal and turbo failures
- •N55 wastegate rattle and plastic charge pipe cracking under boost pressure
Typical Petrol Models
- •630i (E63/E64, G32)
- •640i, 640i xDrive (F06/F12/F13)
- •645Ci, 650i, 650i xDrive (E63/F-generation)
BMW 6 Series Mild Hybrid (MHEV) Engines
MHEVMild hybrid technology appears exclusively on G32 Gran Turismo diesel and petrol variants, using a 48-volt belt-alternator starter to recover braking energy and support smoother stop-start operation.
BMW 6 Series MHEV Engine Codes
- •B47D20A - 620d Gran Turismo, 48V support for improved low-speed refinement
- •B57D30A/C - 630d Gran Turismo, hybrid-assisted torque fill and emissions compliance
- •B58B30A - 640i Gran Turismo, electric boost assistance under acceleration
Found In
- •620d Gran Turismo, 630d Gran Turismo, 640i Gran Turismo (G32, 2019-2023)
Important Notes
- •48-volt belt-alternator starter recovers kinetic energy during deceleration and coasting
- •Electric torque assistance smooths turbo lag and supports seamless stop-start operation
- •Engine replacement requires hybrid system inspection and battery health verification
Not sure which fuel type your BMW 6 Series has- Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK BMW 6 Series specialists.
Engine YearsGet quotes for 2005 BMW 6 Series replacement engines →
BMW 6 Series Engines by YearWhat Was Fitted & WhenBMW 6 Series Engines by Year - What Was Fitted & When
This technical timeline tracks every major engine change across the BMW 6 Series production span, helping owners quickly identify their exact powertrain and compare rebuilt engine prices from UK specialists.
⚙Key Changes
- ✓Introduction of E63 Coupe and E64 Convertible body styles
- ✓N52 magnesium-aluminium straight-six replaces the older M54 family
- ✓N62 4.4L V8 debuts for 645Ci with Valvetronic and double-VANOS
- ✓Advanced iDrive integration and run-flat tyre standardisation
▣Main Engines
N52B30- 3.0L petrol (630i)
N62B44- 4.4L petrol (645Ci)
M57D30- 3.0L diesel (635d)
▰Popular Models
- •BMW 630i
- •BMW 645Ci
- •BMW 635d
🔧Known For
- ✓Classic Pininfarina-styled proportions with refined NA power delivery
- ✓Early SMG2 transmission complexity requires specialist calibration
- ✓M57 diesel proves robust with manageable swirl flap modification options
- ✓N52 valvetronic motors and electric water pumps show wear around 70k miles
Engine Codes Covered:
N52B30N52B30AN62B44N62B44AM57D30Not sure which year your BMW 6 Series was built- Enter your registration number and we'll identify the exact engine, model year, and compatible replacement options instantly - all backed by a minimum 12-month warranty from UK BMW 6 Series specialists.
FAQ