How much does a BMW 6 Series 630i engine replacement cost in the UK?

A reconditioned 630i engine typically costs £1,800–£8,500 supply only depending on generation. N52-era engines sit at the lower end (£1,800–£4,500), while B48 units run £3,500–£8,500. Fitting adds £650–£1,500. Used E63 630i engines can be found from around £1,200 upwards. Use our calculator for a figure specific to your car.

Is the BMW 6 Series 630i engine reliable?

It depends on which of the four engine generations your 630i has. The N52 (E63/E64 pre-2007) is widely considered the most dependable choice in the 6 Series lineup. The N53 (E63/E64 LCI 2007–2010) has HPFP and injector issues. The N55 (F06/F12/F13 2011–2018) is a reliable turbo six but gaskets will need attention. The B48 (G32 2017–2020) is modern and efficient but still has oil and coolant leak concerns. Check the Era Map above for your specific car.

What are the common problems with the BMW 6 Series 630i?

Cooling system failures (water pump, thermostat, expansion tank) and oil leaks (valve cover, oil filter housing) on the N52 and N53; HPFP and injector failure on the N53; oil leaks and HPFP issues on the N55; and oil/coolant leaks on the B48. The N52 is the most reliable overall.

Is it worth replacing a BMW 6 Series 630i engine, or should I scrap the car?

Depends on vehicle value and generation. Against a well-kept £6,000 E63 630i, a £4,000 recon is 67% of the car's value - borderline. Against a tired £4,500 example, the same recon exceeds our 70% BMW threshold - get a scrap valuation first. For F06 N55-engined cars (2011–2018), higher vehicle values (£10,000–£20,000) make replacement more viable.

How do I find my BMW 6 Series 630i engine code?

Listed on the VIN plate and vehicle documentation. As a rule of thumb: E63/E64 (2003–2007) is N52B30 (258 hp), E63/E64 LCI (2007–2010) is N53B30A (268 hp), F06/F12/F13 (2011–2018) is N55B30 (302–320 hp), G32 (2017–2020) is B48B20B (258 hp). Tell us your registration date and we'll confirm it for free.

Can I repair the N53 HPFP, or does it need replacement?

The HPFP typically requires replacement rather than repair (£500–£1,500). Injectors often fail around the same time - when one injector fails, the others are often not far behind. Replacement requires proper coding by a specialist or BMW dealer.

BMW 6 Series 630i2003–20204 Engine Generations

BMW 6 Series 630i Engine Replacement — Compare Prices & Get Quotes

Name: BMW 6 Series 630i UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

The 630i badge spans four generations of BMW grand tourer - from the naturally aspirated N52 and N53 straight-sixes to the turbocharged N55 and B48. Get quotes from trusted UK BMW specialists for every era, supply & fit available nationwide.

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BMW 6 Series 630i Engines - from £1,200 to £8,500Common codes: N52B30, N53B30, N55B30, B48B20

BMW 6 Series 630i Engines - from £1,200 to £8,500· Common codes: N52B30, N53B30, N55B30, B48B20

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The 630i THROUGH TIME - Era Map

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

Era Note

Most dependable 6 Series choice - smooth, reliable, but leaks and cooling

GenerationYearsEngine CodeReliabilityRecon CostEra Note

E63/E64 Coupé/Convertible BMW 320d E63/E64 Coupé/Convertible

2003–2007N52B30A / N52B30BF★★★★☆ [NEWLY ASSIGNED - see Data Note]£1,800–£4,500 [PLACEHOLDER - confirm vs cost sheet]Most dependable 6 Series choice - smooth, reliable, but leaks and cooling

E63/E64 LCI Coupé/Convertible BMW 320d E63/E64 LCI Coupé/Convertible

2007–2010N53B30A★★★☆☆ [NEWLY ASSIGNED - see Data Note]£2,200–£5,000 [PLACEHOLDER - confirm vs cost sheet]Direct-injection six - HPFP and injector issues

F06/F12/F13 Coupé/Convertible/Gran Coupé BMW 320d F06/F12/F13 Coupé/Convertible/Gran Coupé

2011–2018N55B30★★★★☆ [NEWLY ASSIGNED - see Data Note]£3,000–£7,500 [PLACEHOLDER - confirm vs cost sheet]Single-turbo six - reliable but gaskets and HPFP

G32 Gran Turismo BMW 320d G32 Gran Turismo

2017–2020B48B20B★★★★☆ [NEWLY ASSIGNED - see Data Note]£3,500–£8,500 [PLACEHOLDER - confirm vs cost sheet]Turbo four - efficient but oil/coolant leaks

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 630i Engine Replacement Costs

Supply Only£2,500–£7,500

Fitted (Indie)£3,500–£9,000

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£1,200–£3,500£2,000–£5,0001–6 monthsBudget priority; E63/E64 cars

Reconditioned Engine£2,500–£7,500£3,500–£9,00012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£4,000–£8,500£5,000–£10,50012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£7,000–£12,000£8,500–£14,50024–36 monthsInsurance jobs, warranty claims (modern cars only)

Figures above reflect the current B48/N55 generations, the most common quote requests today. Older generations: see the Era Map above for N52 and N53-specific pricing, which runs lower. Used E63 630i engines can be found from around £1,200 upwards.

Labour estimate: Fitting a 6 Series 630i engine typically takes 10–14 hours at £65–£95/hr (independent). The N53's direct-injection system and N55's turbo plumbing require specialist knowledge.

→ Compare 6 Series 630i engine prices from UK specialists

Common Problems With BMW 320d Engines

1. N52/N53 Cooling System & Oil Leaks (E63/E64 2003–2010)

Symptoms: Coolant loss, overheating, steam from engine bay, low coolant warning; burning oil smell, visible oil on engine.

Typical mileage: 60,000–120,000 miles - age-related as plastic and gaskets degrade.

Repair cost: £200–£800 (water pump, thermostat, expansion tank); £300–£700 (valve cover gasket).

Replacement cost: N/A - repair only; ignoring coolant warnings can lead to head gasket failure.

🔴 Immediate - if the coolant warning comes on, pull over and let the engine cool.

Our recommendation:

The N52 and N53 are solid engines, but cooling system components are a known weakness - plastic thermostat housings, radiator end tanks, and water pump impellers become brittle with age. Oil leaks from the valve cover and oil filter housing gaskets are also common. The N53's electric water pump is prone to sudden failure with little warning. If you see any coolant warnings, have the system inspected immediately.

1. N52/N53 Cooling System & Oil Leaks (E63/E64 2003–2010)

Symptoms: Coolant loss, overheating, steam from engine bay, low coolant warning; burning oil smell, visible oil on engine.

Typical mileage: 60,000–120,000 miles - age-related as plastic and gaskets degrade.

Repair cost: £200–£800 (water pump, thermostat, expansion tank); £300–£700 (valve cover gasket).

Replacement cost: N/A - repair only; ignoring coolant warnings can lead to head gasket failure.

🔴 Immediate - if the coolant warning comes on, pull over and let the engine cool.

Our recommendation:

2. N53 High-Pressure Fuel Pump & Injector Failure (E63/E64 LCI 2007–2010)

Symptoms: Long cranking, rough idle, loss of power, engine warning light, stalling, misfires.

Typical mileage: 50,000–100,000 miles.

Repair cost: £500–£1,500 (HPFP replacement); £1,200+ for a full set of injectors.

Replacement cost: N/A - repair only; ignoring symptoms can lead to further engine damage.

🟠 Check - book inspection urgently if symptoms appear.

Our recommendation:

The N53's high-pressure fuel pump and piezo injectors are well-documented weak points. HPFP failure can cause stalling and poor performance. When one injector fails, the others are often not far behind. Replacement requires proper coding by a specialist or BMW dealer. Use high-octane fuel and avoid thrashing the car from cold to help mitigate issues.

3. N55 Oil Leaks & HPFP Issues (F06/F12/F13 2011–2018)

Symptoms: Burning oil smell, visible oil on the engine, low oil level warnings; long cranking, rough idle.

Typical mileage: 60,000–100,000 miles.

Repair cost: £300–£700 (valve cover gasket) / £200–£500 (oil filter housing gasket); £500–£1,500 (HPFP).

Replacement cost: N/A - repair only; if ignored, oil leaks can lead to oil starvation.

🟡 Monitor - book inspection soon if symptoms appear.

Our recommendation:

The N55 is a significant improvement over the N54, but it still suffers from oil leaks from the valve cover and oil filter housing gaskets. HPFP failures can also occur. The oil filter housing gasket leak is particularly critical - oil dripping onto the serpentine belt can cause belt failure and potential engine damage. If you notice a burning oil smell, have the gaskets inspected promptly.

Weighing Your Options?

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6 Series 630i - 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.

6 Series 630i - 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 SenseCooling system failure (N52/N53)✅ Yes£200–£800Simple fix - do it immediately to avoid head gasket failureN53 HPFP failure✅ Yes£500–£1,500Essential repair - vehicle may be undriveable without itValve cover gasket leak (N52/N55)✅ Yes£300–£700Common maintenance item - repair when symptoms appearN53 injector failure✅ Yes£1,200+Replace all six when one fails - coding requiredCatastrophic engine failure❌ Usually NoEngine replacementFull engine replacement required if bottom-end or valvetrain fails

Buying This 630i? Check These First

Buy If

E63/E64 N52 with cooling system refreshed and gaskets replaced - the most dependable 6 Series choice
E63/E64 N53 with HPFP and injectors replaced - but keep a repair fund
F06/F12/F13 N55 with gaskets replaced and service history - reliable turbo six
G32 B48 with full service history - modern and efficient

Avoid If

2007–2010 N53 with no HPFP or injector history - expensive repairs await
Cooling system warnings on any generation - can indicate head gasket failure
Poor service history on any generation - these engines are unforgiving of neglect
N55 with oil filter housing gasket leak - can cause belt failure and engine damage

Closing Verdict

The 630i badge spans a remarkable range of engines - from the dependable N52 to the direct-injection N53, the turbocharged N55, and the modern B48. The N52 (pre-2007 E63/E64) is widely considered the most reliable choice in the 6 Series lineup. The N53 is best avoided unless you have a repair fund for HPFP and injectors. The N55 is a reliable turbo six but gaskets will need attention. The B48 (G32) is modern and efficient but still has oil and coolant leak concerns. With the 70% BMW scrap threshold, a £4,000 recon on a £6,000 E63 630i is 67% - borderline. On a sub-£5,000 example, think carefully.

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

→ Compare 6 Series 630i engine prices before you buy

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Buying Checklist

Before you buy a used BMW 6 Series 630i (or before you commit to an engine replacement), check these:

Cold Start

Listen for rattling or ticking on startup (N52 lifter noise; N53/N55 timing chain)

Service History

Including which engine era and confirmed oil-interval discipline

Coolant Check

Check level and condition - overheating kills these engines

HPFP/Injector History

Any replacement on N53? Keep £1,200+ in reserve

Oil Leaks

Check around valve cover and oil filter housing (N52/N55 common)

Water Pump

Ask if the electric water pump has been replaced (N52/N53)

Engine Warning Light

Have codes been read? Any unresolved issues?

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.

N52B30A / N52B30BF

Years2003–2007

Power258 hp (190 kW)

2025 Enquiries- (pattern data)

Avg. Recon Cost£1,800–£4,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

N52B30A / N52B30BF2003–2007258 hp (190 kW)- (pattern data)£1,800–£4,500 [PLACEHOLDER]

N53B30A2007–2010268 hp (200 kW)- (pattern data)£2,200–£5,000 [PLACEHOLDER]

N55B302011–2018302–320 hp- (pattern data)£3,000–£7,500 [PLACEHOLDER]

B48B20B2017–2020258 hp (190 kW)- (pattern data)£3,500–£8,500 [PLACEHOLDER]

Technical Specs

classic N52B30 - E63/E64

Displacement1,998 cc

Cylinders4-cylinder inline

Compression Ratio10.2:1

Fuel SystemDirect injection

TurbochargerTwin-scroll turbo

Displacement2,996 cc

Cylinders6-cylinder inline

Compression Ratio10.7:1

Fuel SystemSequential fuel injection

TurbochargerNaturally aspirated

→ Compare 6 Series 630i engine prices for your BMW

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Market Intelligence

Most Common Failure

N52/N53 cooling system / N53 HPFP

generation-dependent 【PATTERN DATA】

Average Enquiry Mileage

80,000

miles 【PATTERN DATA】

Average Replacement Cost

£4,000 reconditioned, supply only 【PLACEHOLDER

confirm vs cost sheet】

Most Requested Engine Code

N52B30 (E63 630i

most dependable, highest-volume classic generation) 【PATTERN DATA】

Peak Enquiry Season

Autumn/Winter

MOT season exposes emissions and cooling issues 【PATTERN DATA】

Regional Demand

South East22%

London18%

South West (14%) 【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 630i Owners Trust BMWEngines.uk

Trusted 6 Series 630i Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real 6 Series owners, across every engine era from N52 to B48, including specialists who understand the N53 HPFP issues and N52/N55 cooling system vulnerabilities intimately.
Compare 6 Series 630i Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit, all from specialists experienced with every generation of this grand tourer since 2003.
UK Engine Replacement Services for 630i
supply-only or full supply & fit available nationwide, covering everything from cooling system refresh to HPFP replacement to full engine swaps on your E63, E64, F06, F12, F13 or G32 6 Series.

Find the best BMW 6 Series 630i engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get your 6 Series back on the road with confidence.

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12-Month Warranty

As standard

Nationwide Delivery

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