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BMW B57D30M Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The 3.0-litre inline-6 mild-hybrid diesel fitted to G-series BMW 3, 5, 7 Series and X models from 2020 onwards. Reconditioned units start from £5,000 , with 460 UK replacement requests in 2025 reflecting strong demand for this robust modern powerplant.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£2,800
Reconditioned from
£5,000
Rebuilt from
£7,000
GB
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Key Specs
BMW B57D30M - Specifications at a Glance
Engine Code
B57D30M
Fuel
Diesel (with 48V MHEV)
Configuration
3.0L inline-6, twin-turbo, mild-hybrid
Power Output(s)
286 hp (210 kW) - 340 hp (250 kW)
Years Produced
2020-Present
UK Models Fitted
8 BMW models - full list in Compatibility below
2025 UK Replacement Requests
460
Replaced
B57D30A
Replaced By
B57D30S / B57TU
Most Common Failure
Coolant expansion tank leaks and DPF clogging
Reconditioned Price Range
£5,000-£8,000 supply-only
Vetted UK specialists for B57D30M replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which BMW Models Use the B57D30M-
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 BMW 3 Series | G20/G21 | 340d xDrive | 2020-Present | |
 BMW 4 Series | G22/G23/G26 | 440d xDrive | 2020-Present | |
 BMW 5 Series | G30/G31 | 540d xDrive | 2020-Present | |
| BMW 6 Series GT | G32 | 640d xDrive | 2020-Present | |
| BMW 7 Series | G11/G12 | 740d / 750d xDrive | 2020-Present | |
| BMW X5 | G05 | xDrive40d | 2020-Present | |
| BMW X6 | G06 | xDrive40d | 2020-Present | |
| BMW X7 | G07 | xDrive40d | 2020-Present |
02
BMW 4 Series
03
BMW 5 Series
04
BMW 6 Series GT
05
BMW 7 Series
06
BMW X5
07
BMW X6
08
BMW X7
CROSS-BRAND
B57D30M is documented across 8 BMW applications spanning 3 Series, 4 Series, 5 Series, 6 Series GT, 7 Series, X5, X6, X7. Registration lookup confirms the exact suffix before quotes are sent.
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Not sure which engine your car has- Enter your registration above - we'll confirm your exact B57D30M fitment before any quotes are sent.
Prices
BMW B57D30M Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £2,800-£5,000 | £3,580-£6,040 | 3-6 months |
Reconditioned | £5,000-£8,000 | £5,780-£9,040 | 12-24 months |
Rebuilt | £7,000-£10,500 | £7,780-£11,540 | 12-24 months |
The final cost of a BMW B57D30M engine replacement depends heavily on the condition of the 48V mild-hybrid integration components, the twin-turbo setup, and whether the DPF and AdBlue systems have been regularly serviced. Reconditioned units that include refreshed coolant fittings and updated emissions components sit at the higher end of the scale but offer significantly better long-term reliability. See our full reconditioned engine cost guide for a detailed breakdown of what is included.
Labour Guide
Fitting a B57D30M typically takes 12-16 hours at £65-£78/hr (independent) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
BMW B57D30M Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the B57D30M, based on real-world data and verified failure patterns.
Verified issue focus: Coolant expansion tank leaks and DPF clogging.
1. Coolant Expansion Tank and Plastic Fitting Leaks - 2020+ models
1. Coolant Expansion Tank and Plastic Fitting Leaks - 2020+ models
Typical onset:
100,000-180,000 miles
What happens:
The B57D30M utilises several plastic coolant fittings and an expansion tank that become brittle over time due to heat cycling. This leads to slow coolant leaks, which can cause overheating if left unchecked.
Repair vs replace:
Standalone coolant system repairs are relatively inexpensive (£300-£800) and do not typically necessitate a full BMW B57D30M engine replacement unless severe overheating has warped the cylinder head.
Read more about this issue
2. DPF and AdBlue System Clogging in Urban Use - 2020+ models
2. DPF and AdBlue System Clogging in Urban Use - 2020+ models
Typical onset:
100,000-180,000 miles
What happens:
Like most modern diesels, the B57D30M is sensitive to urban, low-speed driving. The Diesel Particulate Filter (DPF) and AdBlue injectors can clog, leading to limp mode, warning lights, and poor fuel economy.
Repair vs replace:
This is typically repairable via forced DPF regeneration, AdBlue system servicing, or intake cleaning, and does not usually necessitate a full BMW B57D30M engine replacement on its own. Read our full DPF and EGR failure guide.
Read more about this issue
3. Water Pump and Thermostat Housing Seepage - 2020+ models
3. Water Pump and Thermostat Housing Seepage - 2020+ models
Typical onset:
80,000-150,000 miles
What happens:
The electronically controlled water pump and thermostat housing are known weak points on the B57 family. Seepage from the housing or pump failure can lead to coolant loss and potential overheating.
Repair vs replace:
Water pump replacement is a standard repair (£500-£1,000) and is well-understood by BMW specialists. It rarely causes internal engine damage if caught early.
Read more about this issue
The B57 family is considered significantly more reliable than the N57 it replaced, primarily because it utilises a front-mounted timing chain that resolves the catastrophic rear-chain failures of the previous generation .
Compare rebuilt B57D30M prices with the cooling and emissions issues already addressed
Engine Variants
How to Confirm You Have the BMW B57D30M
The B57D30M is the specific 48V mild-hybrid (MHEV) calibration of the broader B57 family, most commonly found in the higher-output '40d' and '540d' badges of the G-series lineup. It is frequently confused with the non-MHEV B57D30A, or the slightly different tunes of the B57D30B and B57D30C.
You can confirm your exact engine code by checking the sticker on the engine block (typically near the oil filter housing or timing cover), reviewing your V5C registration document, or performing a VIN decode. Fitting the wrong revision - particularly confusing a non-MHEV B57D30A with the MHEV B57D30M - will result in ECU mismatch, 48V system faults, and immediate limp mode. Not sure- Enter your registration above - we'll confirm your exact B57D30M fitment before any quotes are sent.
Easily Confused
N57D30A
The N57D30A it replaced featured a rear-mounted timing chain, which the B57 family resolved by moving the chain to the front, though the B57D30M introduces new 48V mild-hybrid complexity.
Confirm the exact B57D30M fitment
You can confirm your exact engine code by checking the sticker on the engine block (typically near the oil filter housing or timing cover), reviewing your V5C registration document, or performing a VIN decode. Fitting the wrong revision - particularly confusing a non-MHEV B57D30A with the MHEV B57D30M - will result in ECU mismatch, 48V system faults, and immediate limp mode. Not sure- Enter your registration above - we'll confirm your exact B57D30M fitment before any quotes are sent.
Buying Guide
Buying a Replacement BMW B57D30M - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used BMW B57D30M engine is only advisable if the seller can provide documented proof that the coolant expansion tank has been replaced with an updated aluminium or reinforced unit, and the 48V MHEV system is fully functional. Without this history, the risk of inheriting a brittle cooling system is too high. Learn more about sourcing used engines.
Reconditioned:
A proper reconditioned BMW B57D30M is the most balanced choice for most owners. A quality rebuild will replace the vulnerable plastic coolant fittings, refresh the water pump and thermostat housing, and ensure the DPF and AdBlue systems are clear, effectively eliminating the engine's primary design weaknesses. Explore reconditioned engines.
Rebuilt:
A full rebuild is justified if the original B57D30M suffered catastrophic failure due to severe overheating or if the 48V MHEV integration requires a complete baseline reset. An upgraded rebuild should include reinforced cooling components and the latest revision of the emissions hardware to prevent recurrence. View rebuilt engines.
Supply & Fit Line:
Buying through our network ensures your replacement BMW B57D30M is installed by vetted UK specialists, backed by a minimum 12-month warranty, with nationwide delivery options for both supply-only and full supply & fit packages.
Vehicle Value Note:
The B57D30M is commonly found in G-series models like the 540d, X5 xDrive40d, and 750d, which typically hold a market value of £15,000-£55,000 depending on age and condition. Because the replacement cost is generally well within the vehicle's retained value, a reconditioned engine is a financially sound investment, and replacement is considered highly viable across almost all examples.
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Related Engines
Engines Related to the BMW B57D30M
Explore engines that are closely related to the BMW B57D30M, including its predecessor, successor, and key family variants.
FAQ
BMW B57D30MFrequently Asked Questions
Question 1How much does a BMW B57D30M engine replacement cost-
A reconditioned BMW B57D30M engine costs between £5,000 and £8,000 for supply only, or £5,780 to £9,040 fully fitted by an independent specialist. Used units start around £2,800 but carry risks regarding cooling system and MHEV component health, and labour typically adds 12-16 hours of work at £65-£78 per hour. Get accurate B57D30M quotes from vetted UK specialists
- Used units start around £2,800 but carry risks regarding cooling system and MHEV component health.
- Labour typically adds 12-16 hours of work at £65-£78 per hour.
Question 2What is the most common problem with the BMW B57D30M-
The most documented issues are coolant leaks from the plastic expansion tank and fittings, alongside DPF clogging in vehicles subjected to urban, low-speed driving. Coolant system repairs are relatively inexpensive (£300-£800) if caught early. Severe overheating from ignored leaks can warp the cylinder head, necessitating a full replacement. Compare rebuilt B57D30M prices with the cooling issues already addressed
- Coolant system repairs are relatively inexpensive (£300-£800) if caught early.
- Severe overheating from ignored leaks can warp the cylinder head, necessitating a full replacement.
Question 3Which BMW models use the B57D30M engine-
The B57D30M was fitted to the 340d, 440d, 540d, 640d, 740d, and xDrive40d badges across the G-series 3, 4, 5, 6, 7 Series, X5, X6, and X7 from 2020 onwards. It is the 48V mild-hybrid (MHEV) evolution of BMW’s 3.0-litre inline-6 diesel, and you should always verify your exact engine code via the V5C or engine bay sticker before ordering parts. Enter your reg to confirm your exact B57D30M fitment
- It is the 48V mild-hybrid (MHEV) evolution of BMW’s 3.0-litre inline-6 diesel.
- Always verify your exact engine code via the V5C or engine bay sticker before ordering parts.
Question 4Should I buy a used or reconditioned BMW B57D30M engine-
A reconditioned BMW B57D30M is strongly recommended over a used unit unless the seller provides documented proof of recent cooling system updates and MHEV health checks. A proper recon replaces vulnerable plastic coolant fittings, refreshes the water pump, and ensures the DPF and AdBlue systems are clear, whereas used units risk inheriting brittle cooling components that will fail shortly after installation. View our guide to buying a replacement B57D30M
- A proper recon replaces vulnerable plastic coolant fittings, refreshes the water pump, and ensures the DPF and AdBlue systems are clear.
- Used units risk inheriting brittle cooling components that will fail shortly after installation.
Question 5How do I know if my car has the B57D30M and not the B57D30A-
You can confirm your engine code by checking the sticker on the engine block, reviewing your V5C registration document, or using our free registration lookup tool. The B57D30M is the specific 48V mild-hybrid calibration, while the B57D30A is the non-MHEV variant, and fitting the wrong revision will result in ECU mismatch, 48V system faults, and immediate limp mode. Check your registration now to confirm your engine code
- The B57D30M is the specific 48V mild-hybrid calibration, while the B57D30A is the non-MHEV variant.
- Fitting the wrong revision will result in ECU mismatch, 48V system faults, and immediate limp mode.
Compare BMW B57D30M Engine Prices Today
Vetted UK specialists who work on the B57D30M and its G-series diesel family every week Minimum 12-month warranty on every reconditioned and rebuilt B57D30M Nationwide delivery - supply-only or full supply & fit Free, no-obligation comparison; quotes specific to the reader's exact code and sub-code; the reg lookup confirms fitment before quotes go out. With reconditioned B57D30M units from £5,000, comparing takes two minutes and could save four figures.
Vetted UK Specialists
Vetted UK specialists for B57D30M replacements
Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
Nationwide Delivery
Nationwide delivery plus supply and fit availability
Expert Support
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