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BMW B57D30C Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The 3.0-litre inline-6 diesel workhorse fitted to the BMW G-series 540d, 740d, and X5 40d, with reconditioned units from £5,000 . Over 460 UK replacement requests were recorded for the B57D30 family in 2025 , reflecting its widespread use in premium heavy-duty applications.
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 B57D30C - Specifications at a Glance
Engine Code
B57D30C
Fuel
Diesel
Configuration
3.0L inline-6, twin-scroll / sequential turbo
Power Output(s)
326 hp (240 kW) or 340 hp (250 kW) / 680-700 Nm
Years Produced
2015-Present
UK Models Fitted
6+ BMW models - full list in Compatibility below
2025 UK Replacement Requests
460 (B57D30 family)
Replaced
N57D30C
Replaced By
B57D30A / B57D30B
Most Common Failure
Coolant system leaks and DPF clogging
Reconditioned Price Range
£5,000-£8,000 supply-only
Vetted UK specialists for B57D30C replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which BMW Models Use the B57D30C-
The B57D30C is the definitive 40d powerplant for BMW’s modern G-generation lineup. Delivering between 326hp and 340hp, it replaced the problematic N57 series to become the primary high-output diesel choice for BMW’s core saloons, estates, and large SUVs from 2015 onwards.
02
BMW 7 Series
03
BMW 6 Series GT
04
BMW X5
05
BMW X6
06
BMW X7
CROSS-BRAND
B57D30C is documented across 6 BMW applications spanning 5 Series, 7 Series, 6 Series GT, X5, X6, X7. Registration lookup confirms the exact suffix before quotes are sent.
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Prices
BMW B57D30C 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 |
All pricing from Table A . Fitted = supply price + labour band below.
Labour Guide
Fitting a B57D30C typically takes 12-16 hours. Independent specialists typically apply a fitted premium of £780-£1,040 on top of the supply cost - confirm exact labour when comparing quotes.
Price Factors
When planning a B57D30C engine replacement, the final cost is heavily influenced by whether the sequential turbochargers and the complex coolant crossover network are included in the supply, and whether the DPF has been professionally cleaned or replaced. Because this engine sits in high-value G-series vehicles, ensuring the replacement unit includes updated plastic coolant fittings is critical to avoiding repeat failures. For a full breakdown of market rates across the 3.0-litre diesel range, see our full reconditioned engine cost guide.
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Common Problems
BMW B57D30C Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the B57D30C, based on real-world data and verified failure patterns.
Verified issue focus: Coolant system leaks and DPF clogging.
1. Coolant System Leaks (Expansion Tank & Plastic Fittings) - 2015-Present models
1. Coolant System Leaks (Expansion Tank & Plastic Fittings) - 2015-Present models
Typical onset:
100,000-180,000 miles
What happens:
The B57D30C utilises a complex network of plastic coolant pipes, crossover fittings, and an expansion tank that become brittle over time due to high under-bonnet temperatures. Leaks typically manifest at the joints or the tank seam, leading to rapid coolant loss. If ignored, this can result in overheating and warped cylinder heads.
Repair vs replace:
Early-stage leaks can be resolved by replacing the affected plastic fittings and expansion tank with revised OEM parts. However, if the engine has been run hot, the cylinder head or block may be compromised, requiring a full B57D30C replacement. Read our full coolant leak failure guide.
Read more about this issue
2. DPF Clogging (Urban Use) - High-mileage units
2. DPF Clogging (Urban Use) - High-mileage units
Typical onset:
100,000-180,000 miles
What happens:
Like all modern diesels, the B57D30C is fitted with a Diesel Particulate Filter. Vehicles used predominantly for short, urban trips fail to reach the exhaust temperatures required for active regeneration. This leads to ash and soot accumulation, increasing backpressure, triggering limp mode, and eventually causing premature turbocharger wear due to exhaust gas starvation.
Repair vs replace:
A forced regeneration or professional chemical clean can resolve early clogging. If the DPF substrate is melted or physically cracked, the unit must be replaced. This rarely writes off the B57D30C engine itself unless turbo damage has occurred. Read our full DPF clogging guide.
Read more about this issue
The B57D30C is considered significantly more reliable than its N57 predecessor. The timing chain is mounted at the front of the engine (unlike the N57's rear-mounted design), making it far more accessible and entirely eliminating the catastrophic, engine-destroying chain failures that plagued the older generation .
Compare rebuilt B57D30C prices with the failure already addressed
Engine Variants
How to Confirm You Have the B57D30C
The B57D30C engine code is physically stamped on a metal tag located on the engine block near the bell housing, but it is most reliably verified via a VIN decoder or by checking the build sheet on your V5C registration document. Owners frequently confuse the 326/340hp B57D30C with other variants in the B57 family. Fitting the wrong revision can result in ECU mapping mismatches, incorrect turbo plumbing, and xDrive calibration faults. Common confusable codes include: - B57D30A - The lower-output 30d variant (typically 286hp). Shares the same block but uses a different single-turbo setup and ECU map. - B57D30B - Another 30d/40d calibration variant, often differing in emissions hardware (EGR/DPF) and intake plumbing depending on the exact chassis and year. - B57D30M - The M50d tri-turbo variant (400hp). Features an entirely different turbocharger arrangement (two low-pressure, one high-pressure) and is not a straight swap for the sequential twin-turbo B57D30C.
Not sure which engine your car has- Enter your registration at the top of the page - our system will confirm your exact B57D30C fitment before any supplier quotes are generated.
Easily Confused
N57D30C
- The 3.0-litre N57 variant the B57D30C directly replaced, which suffered from rear-mounted timing chain stretch and oil pump failures that the B57's front-chain architecture permanently resolved.
Alternative / Next-Gen Code
B57D30A
- The lower-output 30d variant (typically 265-286hp) fitted to the same G-series chassis; shares the same block and coolant weaknesses but uses a single-turbo setup and different ECU calibration.
Related JLR Variants
B57D30B
- Another 30d/40d calibration variant that differs primarily in emissions hardware (EGR/DPF configuration) and intake plumbing depending on the exact chassis and model year.
Confirm the exact B57D30C fitment
Not sure which engine your car has- Enter your registration at the top of the page - our system will confirm your exact B57D30C fitment before any supplier quotes are generated.
Buying Guide
Buying a Replacement B57D30C Engine - 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 B57D30C engine only makes financial sense if it comes with a fully documented service history and proof that the coolant expansion tank and plastic fittings have been inspected or replaced. Without this history, you are inheriting the primary weak point of this design.
Reconditioned:
A proper B57D30C recondition addresses the core weaknesses of this engine: the block is stripped, the brittle plastic coolant fittings are replaced with updated OEM components, and the DPF is professionally cleaned or replaced. This is the most sensible route for a 540d or X5 40d.
Rebuilt:
A full B57D30C rebuild is justified for high-value host vehicles or high-mileage examples, featuring upgraded cooling system components, balanced rotating assemblies, and comprehensive testing to permanently eliminate any factory weaknesses.
Supply & Fit Line:
Our network handles the entire B57D30C supply and fit process, including ECU coding, xDrive alignment, and DPF regeneration resets, backed by a nationwide 12-month warranty.
Vehicle Value Note:
The B57D30C sits in highly desirable G-generation vehicles, such as the G30 540d, G11 740d, and G05 X5 40d, which typically retain values between £15,000 and £55,000. Because the replacement cost is well within the vehicle's retained value, a reconditioned B57D30C engine is a financially sound investment compared to parting out the vehicle.
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Related Engines
Engines Related to the BMW B57D30C
Explore engines that are closely related to the BMW B57D30C, including its predecessor, successor, and key family variants.
Predecessor
N57D30C
- The 3.0-litre N57 variant the B57D30C directly replaced, which suffered from rear-mounted timing chain stretch and oil pump failures that the B57's front-chain architecture permanently resolved.
Sibling
B57D30A
- The lower-output 30d variant (typically 265-286hp) fitted to the same G-series chassis; shares the same block and coolant weaknesses but uses a single-turbo setup and different ECU calibration.
Sibling
B57D30B
- Another 30d/40d calibration variant that differs primarily in emissions hardware (EGR/DPF configuration) and intake plumbing depending on the exact chassis and model year.
Sibling
B57D30M
- The M50d tri-turbo variant producing 400hp; features an entirely different turbocharger arrangement (two low-pressure, one high-pressure) and is not a straight swap for the sequential twin-turbo B57D30C.
FAQ
BMW B57D30CFrequently Asked Questions
Question 1How much does a BMW B57D30C engine replacement cost-
A reconditioned BMW B57D30C 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 inherent coolant system risks. Full rebuilds range from £7,000 to £10,500 supply only. Labour typically adds 12-16 hours with a fitted premium of £780-£1,040.
- Used units start around £2,800 but carry inherent coolant system risks.
- Full rebuilds range from £7,000 to £10,500 supply only.
- Labour typically adds 12-16 hours with a fitted premium of £780-£1,040.
Question 2What is the most common failure with the B57D30C engine-
The dominant failure is coolant system leaks from the expansion tank and brittle plastic crossover fittings, typically occurring between 100,000 and 180,000 miles. The complex network of plastic coolant pipes becomes brittle due to high under-bonnet temperatures. Symptoms include rapid coolant loss, overheating warnings, and in severe cases, warped cylinder heads. Early-stage leaks can be resolved by replacing the affected fittings with revised OEM parts.
- The complex network of plastic coolant pipes becomes brittle due to high under-bonnet temperatures.
- Symptoms include rapid coolant loss, overheating warnings, and in severe cases, warped cylinder heads.
- Early-stage leaks can be resolved by replacing the affected fittings with revised OEM parts.
Question 3Which BMW models use the B57D30C engine-
The B57D30C was fitted to the BMW 540d (G30/G31), 740d (G11/G12), 640d (G32), X5 40d (G05), X6 40d (G06), and X7 40d (G07) between 2015 and 2023. It produces 326-340 hp (240-250 kW) and 680-700 Nm of torque. It is the definitive 40d powerplant for BMW's G-generation lineup. Always verify fitment, as the B57 family includes several output tunes.
- It produces 326-340 hp (240-250 kW) and 680-700 Nm of torque.
- It is the definitive 40d powerplant for BMW's G-generation lineup.
- Always verify fitment, as the B57 family includes several output tunes.
Question 4Should I buy a used or reconditioned B57D30C engine-
A reconditioned B57D30C is strongly recommended over a used unit due to the inherent coolant system risks of this design. Used engines rarely come with documented proof that the plastic coolant fittings and expansion tank have been replaced with updated components. Reconditioned units are stripped, cleaned, and rebuilt with the latest revised coolant fittings and a professionally cleaned or replaced DPF as standard. This eliminates the primary failure point before the engine is installed.
- Used engines rarely come with documented proof that the plastic coolant fittings and expansion tank have been replaced with updated components.
- Reconditioned units are stripped, cleaned, and rebuilt with the latest revised coolant fittings and a professionally cleaned or replaced DPF as standard.
- This eliminates the primary failure point before the engine is installed.
Question 5How do I know if my car has the B57D30C and not the B57D30A or B57D30M-
The exact engine code is stamped on a metal tag on the engine block near the bell housing and is definitively listed on your V5C registration document or via a VIN decoder. The B57D30C is the 326-340hp 40d variant with a sequential twin-turbo setup. The B57D30A is a lower-output 30d (265-286hp) with a single turbo. The B57D30M is the 400hp M50d tri-turbo, which is not a straight swap.
- The B57D30C is the 326-340hp 40d variant with a sequential twin-turbo setup.
- The B57D30A is a lower-output 30d (265-286hp) with a single turbo.
- The B57D30M is the 400hp M50d tri-turbo, which is not a straight swap.
Question 6Does the B57D30C suffer from the same timing chain problems as the N57-
No - the B57D30C features a front-mounted timing chain that is far more accessible and robust than the N57's rear-mounted design. Timing chain stretch on the B57D30C is rare before 100,000 miles and is not considered a dominant failure. The front-mounted location means inspection and replacement are significantly cheaper if needed. The primary concerns for this engine are coolant leaks and DPF clogging, not timing chain failure.
- Timing chain stretch on the B57D30C is rare before 100,000 miles and is not considered a dominant failure.
- The front-mounted location means inspection and replacement are significantly cheaper if needed.
- The primary concerns for this engine are coolant leaks and DPF clogging, not timing chain failure.
Compare BMW B57D30C Engine Prices Today
Vetted UK specialists who work on the B57D30C and its B57 family every week Minimum 12-month warranty on every reconditioned and rebuilt B57D30C Nationwide delivery - supply-only or full supply & fit available Our free, no-obligation comparison is tailored to your exact B57D30C configuration. The registration lookup confirms your precise fitment before any quotes are generated, ensuring you only pay for compatible parts and avoiding costly ECU or turbo plumbing mismatches. With reconditioned B57D30C units starting from £5,000, comparing takes two minutes and could save you hundreds on both supply and labour.
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Vetted UK specialists for B57D30C replacements
Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
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Nationwide delivery plus supply and fit availability
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