How much does a BMW 7 Series 730d engine replacement cost in the UK?

A reconditioned BMW 7 Series 730d engine costs £3,500–£7,000 supply only, varying by generation: M57 £2,500–£4,500, M57TU2 £3,000–£5,000, N57 £4,000–£6,500, B57 £4,500–£7,500, G70 B57 MHEV £5,500–£9,000. Fitting adds £1,000–£1,800. Check the Era Map above for your engine code.

Is the BMW 7 Series 730d reliable?

That depends on which generation. The M57 is robust but ageing; the M57TU2 is refined and generally reliable; the N57 has a rear-mounted timing chain risk (pre-2015); the B57 (G11/G12/G70) is BMW's most advanced and reliable diesel six. The G11/G12 B57 is widely considered the sweet spot - powerful, efficient and exceptionally durable.

What are the common problems with the BMW 7 Series 730d?

M57/M57TU2: injector failure (rough idle, misfire, £300–£800 per injector), DPF/EGR issues (£400–£1,200). N57: timing chain tensioner wear (cold-start rattle, £1,500–£3,500), injector failure, DPF/EGR. B57: cooling system leaks (£400–£1,000), DPF/EGR issues (less common). G70 B57: 48V MHEV system issues (£800–£2,500).

Is it worth replacing a BMW 7 Series 730d engine, or should I scrap the car?

7 Series 730d values range from £3,000–£70,000 depending on generation, condition and mileage. A £3,500–£7,000 reconditioned engine represents 10–80% of vehicle value - our 70% BMW scrap threshold means careful evaluation is required. For a well-maintained G11/G12 or G70, replacement is almost always justified. For an ageing E38/E65 with other issues, assess scrap value first.

How do I find my BMW 7 Series 730d engine code?

The 730d has used five engine variants: M57D30 (E38, 1996–2001, 193bhp), M57TU2 (E65, 2002–2008, 231bhp), N57D30 (F01, 2009–2015, 245bhp), B57D30 (G11/G12, 2016–2022, 265bhp), and B57D30 MHEV (G70, 2023–present, 286bhp). Check your VIN or registration year. The code is stamped on the engine block.

Can I repair the N57 timing chain issue, or does it need replacement?

Yes - if caught early. Timing chain and guide replacement costs £1,500–£3,500 and is significantly cheaper than a full engine replacement (£4,000–£6,500). The job requires engine removal on the F01, making it a major investment. At the first sign of cold-start rattle, book an inspection immediately - ignored chain wear can lead to catastrophic piston-valve contact.

BMW 7 Series 730d1996–presentFive Diesel Generations

BMW 7 Series 730d Engine Replacement — Compare Prices & Get Quotes

Name: BMW 7 Series 730d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW diesel specialists. The 730d is BMW's flagship diesel - from the M57 in the E38 to the modern B57. Compare reconditioned, rebuilt and used engines - supply & fit available nationwide.

Supply & Fit Available

12-Month Warranty

Nationwide Delivery

20+ Specialists

Supply & Fit Available

12-Month Warranty

Nationwide Delivery

20+ Specialists

BMW 7 Series 730d Engines - from £1,500 to £10,000Codes: M57, <a href='https://bmwengines.uk/engine/n57'>N57</a>, B57

BMW 7 Series 730d Engines - from £1,500 to £10,000· Codes: M57, <a href='https://bmwengines.uk/engine/n57'>N57</a>, B57

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

BMW 7 Series 730d - Which Engine Does Your Car Actually Have?

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

Era Note

BMW's first 7 Series diesel - 193bhp, robust but aged

GenerationYearsEngine CodeReliabilityRecon CostEra Note

E38 730d

1996–2001M57D30 (3.0L turbo diesel)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£2,500–£4,500 [PLACEHOLDER - confirm vs cost sheet]BMW's first 7 Series diesel - 193bhp, robust but aged

E65/E66 730d BMW 320d E65/E66 730d

2002–2008M57TU2 (3.0L turbo diesel)★★★★☆ [NEWLY ASSIGNED - see Data Note]£3,000–£5,000 [PLACEHOLDER - confirm vs cost sheet]231bhp - refined, improved DPF, injectors need monitoring

F01/F02 730d BMW 320d F01/F02 730d

2009–2015N57D30 (3.0L twin-turbo)★★★½☆ [NEWLY ASSIGNED - see Data Note]£4,000–£6,500 [PLACEHOLDER - confirm vs cost sheet]245bhp - chain tensioner and DPF are key watchpoints

G11/G12 730d BMW 320d G11/G12 730d

2016–2022B57D30 (3.0L turbo)★★★★½☆ [NEWLY ASSIGNED - see Data Note]£4,500–£7,500 [PLACEHOLDER - confirm vs cost sheet]265bhp - modern B57, chain front-mounted, very robust

G70 730d

2023–presentB57D30 (3.0L turbo, 48V MHEV)★★★★½☆ [NEWLY ASSIGNED - see Data Note]£5,500–£9,000 [PLACEHOLDER - confirm vs cost sheet]286bhp with MHEV - latest refinement, 48V complexity added

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 7 Series 730d Engine Replacement Costs

Supply Only£3,500–£7,000

Fitted (Indie)£4,400–£8,200

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£1,500–£4,500£2,400–£5,7001–6 monthsBudget priority; older E38/E65 donors

Reconditioned Engine£3,500–£7,000£4,400–£8,20012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£5,000–£10,000£5,900–£11,20012–24 monthsLong-term ownership; 5+ year horizon

Main Dealer New£8,000–£15,000£9,500–£16,50024–36 monthsInsurance jobs, warranty claims

Figures above reflect current market ranges across all 730d generations. Older generations (E38/E65) typically run lower on the used market. See the Era Map above for generation-specific pricing.

Labour estimate: Fitting a 7 Series 730d engine typically takes 10–18 hours at £70–£100/hr (independent BMW specialist) or £120–£170/hr (London/SE dealer). The B57's 48V system adds complexity for G70 models.

→ Compare BMW 7 Series 730d engine prices from UK specialists

Common Problems With BMW 320d Engines

1. Timing Chain Tensioner Wear (N57 - F01, Pre-2015)

2. DPF Blockage and EGR System Issues (M57TU2, N57 and B57)

3. Injector Failure (M57, M57TU2 and N57)

4. 48V Mild-Hybrid System Issues (B57 - G70)

Ready to Compare?

Get Matched With a Vetted BMW Specialist

20+ vetted BMW specialists, covering every 730d era - M57, M57TU2, N57 and B57 - with a 12-month warranty as standard.

Get My Free BMW 730d Engine Quotes Now

BMW 7 Series 730d - 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 7 Series 730d - 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 SenseN57 timing chain tensioner✅ Yes£1,500–£3,500Preventative - cheaper than engine replacementInjector failure✅ Yes£300–£800 per injectorReplace all six for reliabilityDPF blockage✅ Yes£400–£1,200Forced regen or cleaning - worth itEGR cooler failure✅ Yes£500–£1,200Straightforward repair - always worth doing48V MHEV system issues (G70)✅ Yes£800–£2,500Viable on a vehicle worth £70,000+Major internal failure❌ Usually NoEngine replacement requiredAssess vehicle value carefully

Buying This BMW 7 Series 730d? Check These First

Buy If

G11/G12 or G70 (B57) - the most refined and reliable 730d generations
F01 post-2015 (revised N57 chain guides)
Full service history with regular oil changes (8,000–10,000 miles)
Documented injector history (M57/N57) or timing chain history (N57)
Regular long journeys (DPF-friendly usage pattern)

Avoid If

F01 pre-2015 with no timing chain history - the risk is real
Any evidence of DPF or EGR issues - warning lights, reduced power
Short-journey-only history - DPF issues are almost certain
Poor service history - all 730d engines are unforgiving of neglect

Closing Verdict

The 730d is BMW's quintessential luxury diesel - refined, effortless and capable of immense mileages. The E38 started it all, the E65 refined it, the F01 added power, and the G11/G12/G70 perfected it. The B57-powered G11/G12 and G70 are the most reliable, the N57 F01 has a chain risk (pre-2015), and the M57-era cars are robust but ageing. Buy the newest you can afford, maintain it properly, and the 730d will cover quarter-million miles with ease.

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

→ Compare BMW 7 Series 730d 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 7 Series 730d engine prices before you buy

20+ Vetted Specialists UK Network

12-Month Warranty as Standard

Nationwide Delivery & Collection

Transparent Pricing, No Hidden Fees

Thousands of 320d Owners Helped

Buying Checklist

Before you buy a used BMW 7 Series 730d (or before you commit to an engine replacement), check these:

Cold Start

Any rattle? N57 chain rattle is the biggest warning; M57/B57 should be quiet

Service History

Check the year to identify which engine - see the Era Map above

Timing Chain History

N57: chains replaced? Tensioner checked? (pre-2015 is critical)

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

48V System (G70)

Any battery warnings? MHEV system checked?

Engine Warning Light

Have codes been read? Resolve before buying

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.

M57D30 (3.0L turbo diesel)

Years1996–2001

Power193 bhp

2025 Enquiries- (pattern data - heritage)

Avg. Recon Cost£2,500–£4,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

M57D30 (3.0L turbo diesel)1996–2001193 bhp- (pattern data - heritage)£2,500–£4,500 [PLACEHOLDER]

M57TU2 (3.0L turbo diesel)2002–2008231 bhp- (pattern data - high-volume UK)£3,000–£5,000 [PLACEHOLDER]

N57D30 (3.0L twin-turbo)2009–2015245 bhp830 JLR-wide [EM-VERIFIED]£4,000–£6,500 [PLACEHOLDER]

B57D30 (3.0L turbo)2016–2022265 bhp460 JLR-wide [EM-VERIFIED]£4,500–£7,500 [PLACEHOLDER]

B57D30 (3.0L turbo, 48V MHEV)2023–present286 bhp- (pattern data - premium diesel)£5,500–£9,000 [PLACEHOLDER]

Technical Specs

B57D30

Displacement2,926 cc

Cylinders6-cylinder inline

Compression Ratio18.0:1

Fuel SystemCommon-rail direct injection

TurbochargerSingle variable-geometry

Displacement2,993 cc

Cylinders6-cylinder inline

Compression Ratio17.0:1

Fuel SystemCommon-rail (piezo injectors)

TurbochargerSingle VTG (updated)

Displacement2,993 cc

Cylinders6-cylinder inline

Compression Ratio16.5:1

Fuel SystemCommon-rail (piezo injectors)

TurbochargerTwin-turbo (sequential)

Displacement2,993 cc

Cylinders6-cylinder inline

Compression Ratio16.5:1

Fuel SystemCommon-rail (latest generation)

TurbochargerSingle turbo (G11/G12) / Single turbo with MHEV (G70)

→ Compare BMW 7 Series 730d engine prices for your BMW

Get quotes from trusted UK specialists in minutes.

Market Intelligence

Most Common Failure

N57: timing chain tensioner (~50% of F01 enquiries) / M57: injector failure (~40% of E38/E65 enquiries) / B57: cooling system leaks (~35% of G11/G12 enquiries)

[PATTERN DATA - specialist workshop consensus]

Average Enquiry Mileage

80,000

miles

[PATTERN DATA]

Average Replacement Cost

£5,500

reconditioned (B57 era), supply only

[PLACEHOLDER - confirm vs cost sheet]

Most Requested Engine Code

B57D30 (G11/G12 730d is a high-volume UK premium diesel)【PATTERN DATA】

Peak Enquiry Season

Autumn/Winter

cold starts expose timing chain issues; DPF issues worsen in winter【PATTERN DATA】

Regional Demand

South East23%

London20%

South West (15%)【PATTERN DATA】

Regional Demand Breakdown

23%South East

20%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 7 Series 730d Owners Trust BMWEngines.uk

Trusted BMW 730d Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real 7 Series owners, as part of the Engine Finders network, with specialist knowledge of M57, M57TU2, N57 and B57 engines across all five 730d generations.
Compare BMW 730d Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with transparent pricing for every 730d era from E38 to G70.
UK Engine Replacement Services for BMW 730d
supply‑only or full supply & fit available nationwide, covering every 7 Series generation with specialists who understand these flagship BMW diesels.

Find the best BMW 7 Series 730d engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Compare BMW 7 Series 730d Engine Prices Now

100% Free

No hidden fees

No Obligation

Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available

100% Free

No hidden fees

No Obligation

Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available