BMW 7 Series 730d1996–presentFive Diesel Generations
BMW 7 Series 730d Engine Replacement —Compare Prices &
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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.
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BMW 7 Series 730d Engines — from £1,500 to £10,000Codes: M57, N57, B57
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BMW 7 Series 730d — Which Engine Does Your Car Actually Have?
Five generations. Five eras. One guide to reliability, costs and what really matters.
Era Note
BMW's first 7 Series diesel — 193bhp, robust but aged
Era Note
231bhp — refined, improved DPF, injectors need monitoring
Era Note
245bhp — chain tensioner and DPF are key watchpoints
Era Note
265bhp — modern B57, chain front-mounted, very robust
Era Note
286bhp with MHEV — latest refinement, 48V complexity added
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 7 Series 730d Engine Replacement Costs
- Supply Only£1,500 – £4,500
- Fitted (Indie)£2,400 – £5,700
- Warranty1–6 months
- Best ForBudget priority; older E38/E65 donors
- Supply Only£3,500 – £7,000
- Fitted (Indie)£4,400 – £8,200
- Warranty12–24 months
- Best ForMost owners — best cost/warranty balance
- Supply Only£5,000 – £10,000
- Fitted (Indie)£5,900 – £11,200
- Warranty12–24 months
- Best ForLong-term ownership; 5+ year horizon
- Supply Only£8,000 – £15,000
- Fitted (Indie)£9,500 – £16,500
- Warranty24–36 months
- Best ForInsurance 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.
Common Problems With BMW 7 Series 730d Engines
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)
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20+ vetted BMW specialists, covering every 730d era — M57, M57TU2, N57 and B57 — with a 12-month warranty as standard.
7 Series 730d — 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 |
|---|---|---|---|
| N57 timing chain tensioner | Yes | £1,500 – £3,500 | Preventative — cheaper than engine replacement |
| Injector failure | Yes | £300 – £800 per injector | Replace all six for reliability |
| DPF blockage | Yes | £400 – £1,200 | Forced regen or cleaning — worth it |
| EGR cooler failure | Yes | £500 – £1,200 | Straightforward repair — always worth doing |
| 48V MHEV system issues (G70) | Yes | £800 – £2,500 | Viable on a vehicle worth £70,000+ |
| Major internal failure | Usually No | Engine replacement required | Assess vehicle value carefully |
ProblemRepairable? · Typical Cost
N57 timing chain tensioner
Yes£1,500 – £3,500
Preventative — cheaper than engine replacement
Injector failure
Yes£300 – £800 per injector
Replace all six for reliability
DPF blockage
Yes£400 – £1,200
Forced regen or cleaning — worth it
EGR cooler failure
Yes£500 – £1,200
Straightforward repair — always worth doing
48V MHEV system issues (G70)
Yes£800 – £2,500
Viable on a vehicle worth £70,000+
Major internal failure
Usually NoEngine replacement required
Assess 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.
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Buying Checklist
Before you buy a used BMW 7 Series 730d (or before you commit to an engine replacement), check these:
1. Cold Start
Any rattle? N57 chain rattle is the biggest warning; M57/B57 should be quiet
2. Service History
Check the year to identify which engine — see the Era Map above
3. Timing Chain History
N57: chains replaced? Tensioner checked? (pre-2015 is critical)
4. DPF History
Ask about driving patterns; frequent short trips cause DPF issues
5. EGR System
Any coolant loss or white smoke? EGR cooler failure is common
6. Injector Performance
Check for smooth acceleration; injector issues are common on high-mileage cars
7. 48V System (G70)
Any battery warnings? MHEV system checked?
8. Engine Warning Light
Have codes been read? Resolve before buying
Buying Checklist
Before you buy a used BMW 7 Series 730d (or before you commit to an engine replacement), check these:
- 1
Cold Start
Any rattle? N57 chain rattle is the biggest warning; M57/B57 should be quiet
- 2
Service History
Check the year to identify which engine — see the Era Map above
- 3
Timing Chain History
N57: chains replaced? Tensioner checked? (pre-2015 is critical)
- 4
DPF History
Ask about driving patterns; frequent short trips cause DPF issues
- 5
EGR System
Any coolant loss or white smoke? EGR cooler failure is common
- 6
Injector Performance
Check for smooth acceleration; injector issues are common on high-mileage cars
- 7
48V System (G70)
Any battery warnings? MHEV system checked?
- 8
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 7 Series 730d pitfalls.
Engine Codes
This table's rows match Section 1B's Era Map exactly.
M57D30 (3.0L turbo diesel)
- Years
- 1996–2001
- Power
- 193 bhp
- 2025 Enquiries
- —(pattern data - heritage)
- Avg. Recon Cost
- £2,500–£4,500[PLACEHOLDER]
M57TU2 (3.0L turbo diesel)
- Years
- 2002–2008
- Power
- 231 bhp
- 2025 Enquiries
- —(pattern data - high-volume UK)
- Avg. Recon Cost
- £3,000–£5,000[PLACEHOLDER]
N57D30 (3.0L twin-turbo)
- Years
- 2009–2015
- Power
- 245 bhp
- 2025 Enquiries
- 830 JLR-wide[EM-VERIFIED]
- Avg. Recon Cost
- £4,000–£6,500[PLACEHOLDER]
B57D30 (3.0L turbo)
- Years
- 2016–2022
- Power
- 265 bhp
- 2025 Enquiries
- 460 JLR-wide[EM-VERIFIED]
- Avg. Recon Cost
- £4,500–£7,500[PLACEHOLDER]
B57D30 (3.0L turbo, 48V MHEV)
- Years
- 2023–present
- Power
- 286 bhp
- 2025 Enquiries
- —(pattern data - premium diesel)
- Avg. Recon Cost
- £5,500–£9,000[PLACEHOLDER]
Technical SpecsB57D30
- Displacement
- 2,926 cc
- Cylinders
- 6-cylinder inline
- Compression Ratio
- 18.0:1
- Fuel System
- Common-rail direct injection
- Turbocharger
- Single variable-geometry
- Displacement
- 2,993 cc
- Cylinders
- 6-cylinder inline
- Compression Ratio
- 17.0:1
- Fuel System
- Common-rail (piezo injectors)
- Turbocharger
- Single VTG (updated)
- Displacement
- 2,993 cc
- Cylinders
- 6-cylinder inline
- Compression Ratio
- 16.5:1
- Fuel System
- Common-rail (piezo injectors)
- Turbocharger
- Twin-turbo (sequential)
- Displacement
- 2,993 cc
- Cylinders
- 6-cylinder inline
- Compression Ratio
- 16.5:1
- Fuel System
- Common-rail (latest generation)
- Turbocharger
- Single turbo (G11/G12) / Single turbo with MHEV (G70)
Market Intelligence
Real data from thousands of 7 Series 730d enquiries in 2025.
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]Average Enquiry Mileage
80,000
miles
[PATTERN DATA]Average Replacement Cost
£5,500
reconditioned (B57 era), supply only
[PLACEHOLDER]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 East
- 23%
- London
- 20%
- South West
- 15%
- Other Regions
- 42%
Regional Demand Breakdown
20%London23%South East15%South West42%Other Regions
Frequently Asked Questions
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.
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.
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).
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.
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.
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.
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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