BMW 6 Series 630i2003–20204 Engine Generations

BMW 6 Series 630i Engine Replacement —Compare Prices &
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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

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Reconditioned
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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

Era Note

Direct-injection six — HPFP and injector issues

Era Note

Single-turbo six — reliable but gaskets and HPFP

Era Note

Turbo four — efficient but oil/coolant leaks

Generation	Years	Engine Code	Recon Cost (Guide)	Era Note
E63/E64 Coupé/Convertible	2003–2007	N52B30A / N52B30BF	£1,800–£4,500[PLACEHOLDER]	Most dependable 6 Series choice — smooth, reliable, but leaks and cooling
E63/E64 LCI Coupé/Convertible	2007–2010	N53B30A	£2,200–£5,000[PLACEHOLDER]	Direct-injection six — HPFP and injector issues
F06/F12/F13 Coupé/Convertible/Gran Coupé	2011–2018	N55B30	£3,000–£7,500[PLACEHOLDER]	Single-turbo six — reliable but gaskets and HPFP
G32 Gran Turismo	2017–2020	B48B20B	£3,500–£8,500[PLACEHOLDER]	Turbo four — efficient but oil/coolant leaks

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 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 Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£1,200 – £3,500	£2,000 – £5,000	1–6 months	Budget priority; E63/E64 cars
Reconditioned Engine	£2,500 – £7,500	£3,500 – £9,000	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£4,000 – £8,500	£5,000 – £10,500	12–24 months	Long-term ownership; 3+ year horizon
Main Dealer New	£7,000 – £12,000	£8,500 – £14,500	24–36 months	Insurance 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.

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Common Problems With BMW 6 Series 630i 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.
Urgency: 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.
Urgency: 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.
Urgency: 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.
Urgency: 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.

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6 Series 630i — 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
Cooling system failure (N52/N53)	Yes	£200 – £800	Simple fix — do it immediately to avoid head gasket failure
N53 HPFP failure	Yes	£500 – £1,500	Essential repair — vehicle may be undriveable without it
Valve cover gasket leak (N52/N55)	Yes	£300 – £700	Common maintenance item — repair when symptoms appear
N53 injector failure	Yes	£1,200+	Replace all six when one fails — coding required
Catastrophic engine failure	Usually No	Engine replacement	Full engine replacement required if bottom-end or valvetrain fails

ProblemRepairable? · Typical Cost

Cooling system failure (N52/N53)

Yes£200 – £800

Simple fix — do it immediately to avoid head gasket failure

N53 HPFP failure

Yes£500 – £1,500

Essential repair — vehicle may be undriveable without it

Valve cover gasket leak (N52/N55)

Yes£300 – £700

Common maintenance item — repair when symptoms appear

N53 injector failure

Yes£1,200+

Replace all six when one fails — coding required

Catastrophic engine failure

Usually NoEngine replacement

Full 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.

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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:

1. Cold Start
Listen for rattling or ticking on startup (N52 lifter noise; N53/N55 timing chain)
2. Service History
Including which engine era and confirmed oil-interval discipline
3. Coolant Check
Check level and condition — overheating kills these engines
4. HPFP/Injector History
Any replacement on N53? Keep £1,200+ in reserve
5. Oil Leaks
Check around valve cover and oil filter housing (N52/N55 common)
6. Water Pump
Ask if the electric water pump has been replaced (N52/N53)
7. Engine Warning Light
Have codes been read? Any unresolved issues?
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 630i is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

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

1
Cold Start
Listen for rattling or ticking on startup (N52 lifter noise; N53/N55 timing chain)
2
Service History
Including which engine era and confirmed oil-interval discipline
3
Coolant Check
Check level and condition — overheating kills these engines
4
HPFP/Injector History
Any replacement on N53? Keep £1,200+ in reserve
5
Oil Leaks
Check around valve cover and oil filter housing (N52/N55 common)
6
Water Pump
Ask if the electric water pump has been replaced (N52/N53)
7
Engine Warning Light
Have codes been read? Any unresolved issues?
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 630i pitfalls.

Engine Codes

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

N52B30A / N52B30BF

Years: 2003–2007
Power: 258 hp (190 kW)
2025 Enquiries: —(pattern data)
Avg. Recon Cost: £1,800–£4,500[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
N52B30A / N52B30BF	2003–2007	258 hp (190 kW)	—(pattern data)	£1,800–£4,500[PLACEHOLDER]
N53B30A	2007–2010	268 hp (200 kW)	—(pattern data)	£2,200–£5,000[PLACEHOLDER]
N55B30	2011–2018	302–320 hp	—(pattern data)	£3,000–£7,500[PLACEHOLDER]
B48B20B	2017–2020	258 hp (190 kW)	—(pattern data)	£3,500–£8,500[PLACEHOLDER]

Technical Specsclassic N52B30 — E63/E64

Displacement: 1,998 cc
Cylinders: 4-cylinder inline
Compression Ratio: 10.2:1
Fuel System: Direct injection
Turbocharger: Twin-scroll turbo
Displacement: 2,996 cc
Cylinders: 6-cylinder inline
Compression Ratio: 10.7:1
Fuel System: Sequential fuel injection
Turbocharger: Naturally aspirated

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Market Intelligence

Real data from thousands of 6 Series 630i enquiries in 2025.

Most Common FailureN52/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]

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 East: 22%
London: 18%
South West: 14%
Other Regions: 46%

[PATTERN DATA]

Regional Demand Breakdown

18%London22%South East14%South West46%Other Regions

Frequently Asked Questions

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.

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.

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.

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.

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.

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.

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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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.
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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.

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

The 630i Through Time — Era Map

BMW 6 Series 630i Engine Replacement Costs

Common Problems With BMW 6 Series 630i Engines

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

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

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

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

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

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

Weighing Your Options?

6 Series 630i — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This 630i? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 6 Series 630i Owners Trust BMWEngines.uk

Trusted 6 Series 630i Engine Suppliers

Compare 6 Series 630i Engine Replacement Companies

UK Engine Replacement Services for 630i

BMW 6 Series 630i Engine Replacement —Compare Prices &
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