BMW X4 30d2014–presentN57 / B57 3.0 Straight-Six Diesel

BMW X4 30d Engine Replacement -Compare Prices & Get Quotes

Get quotes today from trusted UK BMW X4 30d specialists. Compare reconditioned, rebuilt and used N57 and B57 3.0-litre straight-six diesel engines -supply & fit available nationwide for BMW's sporty coupé-SUV.

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BMW X4 30d Engines -from £2,500 to £9,500Common codes: N57D30, B57D30

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The X4 30d Through Time -Era Map

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

Era Note

First-gen N57 straight-six -258 bhp, 560 Nm; timing chain wear and bottom-end bearings are the key watchpoints

Era Note

B57 single-turbo -261 bhp, 620 Nm; improved reliability but DPF and emissions system issues need attention

Era Note

Latest B57 with mild-hybrid -286 bhp, 650 Nm; proven B57 engine with added 48V MHEV complexity

Generation	Years	Engine Code	Reliability	Recon Cost (Guide)	Era Note
X4 F26	2014–2018	N57D30(3.0L I6 diesel, 258 bhp)	[NEWLY ASSIGNED -see Data Note]	£4,000–£7,500[PLACEHOLDER -confirm vs cost sheet]	First-gen N57 straight-six -258 bhp, 560 Nm; timing chain wear and bottom-end bearings are the key watchpoints
X4 G02	2018–2022	B57D30(3.0L I6 diesel, 261 bhp)	[NEWLY ASSIGNED -see Data Note]	£4,500–£8,500[PLACEHOLDER -confirm vs cost sheet]	B57 single-turbo -261 bhp, 620 Nm; improved reliability but DPF and emissions system issues need attention
X4 G02 LCI	2022–present	B57D30B(3.0L I6 diesel + 48V MHEV, 286 bhp)	[NEWLY ASSIGNED -see Data Note]	£5,000–£9,500[PLACEHOLDER -confirm vs cost sheet]	Latest B57 with mild-hybrid -286 bhp, 650 Nm; proven B57 engine with added 48V MHEV complexity

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 X4 30d Engine Replacement Costs

Supply Only£4,000 – £7,500
Fitted (Indie)£5,200 – £9,000
Warranty12–24 months
Best ForMost owners -best cost/warranty balance

Engine Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£2,500 – £4,500	£3,500 – £5,800	1–6 months	Budget priority; vehicle under £10,000
Reconditioned Engine	£4,000 – £7,500	£5,200 – £9,000	12–24 months	Most owners -best cost/warranty balance
Rebuilt Engine	£5,500 – £9,500	£6,800 – £11,000	12–24 months	Long-term ownership; 3+ year horizon
Main Dealer New	£8,000 – £12,000	£9,500 – £14,000	24–36 months	Insurance jobs, warranty claims

Figures above reflect the current X4 30d range. Older generations: see the Era Map above for F26/N57 and G02/B57-specific pricing. Reconditioned BMW engines typically range from £1,200–£2,200 supply only, with fitted costs around £1,800–£2,800 for smaller engines -the X4 30d's six-cylinder diesel commands a premium.

Labour estimate: Fitting an X4 30d engine typically takes 10–14 hours at £75–£110/hr (independent) or £130–£180/hr (London/SE dealer). N57 timing chain work is a significant job. [PLACEHOLDER -confirm vs cost sheet]

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Common Problems With BMW X4 30d Engines

1. N57 Timing Chain & Guide Wear(F26)

Symptoms: Rattling noise from the engine on cold start, metallic clattering, engine warning light, loss of power, potential engine failure if chain skips or snaps.
Typical Mileage: 80,000–120,000 miles (120,000–200,000 km is a known threshold)
Repair Cost: £1,500–£3,500 (timing chain, tensioner and guide replacement)【PLACEHOLDER】
Replacement Cost: £4,000–£7,500 (if chain snaps and valves meet pistons)【PLACEHOLDER】
Urgency: Immediate — if you hear rattle, book an inspection today

Our recommendation:

The N57's timing chain is a known weak point. While less notorious than the four-cylinder N47, chain stretch and tensioner failure can occur, particularly on higher-mileage examples. A rattling or clattering noise from the engine, especially during startup, can indicate a loose or worn timing chain. Over time, the chain can stretch due to wear and tear, affecting the engine's timing. A cold-start rattle is the early warning sign -ignore it and you risk piston-valve contact and a full engine replacement. Regular oil changes with the correct BMW-approved oil are the best prevention. At the first sign of rattle, get it inspected immediately.

1. N57 Timing Chain & Guide Wear(F26)

Symptoms: Rattling noise from the engine on cold start, metallic clattering, engine warning light, loss of power, potential engine failure if chain skips or snaps.
Typical Mileage: 80,000–120,000 miles (120,000–200,000 km is a known threshold)
Repair Cost: £1,500–£3,500 (timing chain, tensioner and guide replacement)【PLACEHOLDER】
Replacement Cost: £4,000–£7,500 (if chain snaps and valves meet pistons)【PLACEHOLDER】
Urgency: Immediate — if you hear rattle, book an inspection today

Our recommendation:

2. Diesel Particulate Filter (DPF) Clogging(All Generations)

Symptoms: DPF warning light, reduced power, increased fuel consumption, frequent regeneration cycles, "Drivetrain Malfunction" warning, smoke during acceleration.
Typical Mileage: 37,000–62,000 miles (60,000–100,000 km)
Repair Cost: £200–£800 (DPF clean, forced regeneration, or sensor replacement)【PLACEHOLDER】
Replacement Cost: £1,000–£2,500 (DPF replacement)【PLACEHOLDER】
Urgency: Monitor — book inspection soon; can lead to costly emissions system damage

Our recommendation:

DPF clogging is one of the most common issues on both N57 and B57 engines, particularly on cars driven mostly in the city. A 2020 BMW X4 diesel owner reported DPF issues including warning lights, reduced power, and smoke during acceleration, with failed regeneration and emissions problems. The suspected cause was a faulty exhaust back pressure sensor, which can prevent proper DPF regeneration. If you see a DPF warning light, take the car for a sustained motorway run at 2,000–2,500 rpm. If the light persists, have the DPF inspected. Regular motorway driving and using premium diesel can help keep the DPF healthy.

3. EGR Valve & Cooler Failure(B57 & N57)

Symptoms: Engine warning light, loss of power, rough idle, increased fuel consumption, white smoke from exhaust, "Drivetrain Malfunction" warning.
Typical Mileage: 40,000–80,000 miles
Repair Cost: £400–£1,200 (EGR valve or cooler replacement)【PLACEHOLDER】
Replacement Cost: N/A -repair only (unless coolant loss leads to engine damage)
Urgency: Check — book inspection urgently if warning light appears

Our recommendation:

EGR valve and cooler failures are common on both N57 and B57 engines. Carbon accumulates in the intake, and EGR flow becomes inconsistent. On short-distance driven cars, the EGR system is particularly prone to clogging. BMW has issued recalls for EGR cooler failures on some diesel applications. If you notice a loss of power or a warning light, have the EGR system inspected promptly.

4. Oil Leaks(Oil Filter Housing & Turbocharger)

Symptoms: Oil spots under the vehicle, burning oil smell, visible oil seepage around the oil filter housing or turbocharger, low oil level warning.
Typical Mileage: 50,000–100,000 miles
Repair Cost: £300–£900 (oil filter housing gasket or turbo oil line replacement)【PLACEHOLDER】
Replacement Cost: N/A -repair only
Urgency: Monitor — book inspection soon; oil leaks can damage other components

Our recommendation:

Oil leaks are among the most frequently reported issues on both N57 and B57 engines. Leaks commonly occur around the oil filter housing and the turbocharger. If you notice oil spots under the car or a burning smell, have it inspected promptly. Regular inspections can catch these before they become major issues.

5. Boost Leaks & Turbocharger Issues

Symptoms: Loss of power, whistling or hissing sound under acceleration, black smoke, increased fuel consumption, engine warning light.
Typical Mileage: 60,000–120,000 miles
Repair Cost: £500–£1,500 (boost leak diagnosis and repair, turbo actuator or sensor replacement)【PLACEHOLDER】
Replacement Cost: £1,500–£3,000 (if turbocharger requires replacement)【PLACEHOLDER】
Urgency: Check — book inspection urgently if power loss or whistling occurs

Our recommendation:

X4 30d models can experience boost-related issues. Common triggers include turbocharger underboost or actuator failure, faulty fuel injectors, and ECU miscommunication. High fuel consumption can also be linked to turbocharger or intercooler leaks. If you notice a whistling sound or loss of power, have the boost system inspected immediately.

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X4 30d -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 rattle (preventative)	Yes	£1,500 – £3,500	Catch it early -far cheaper than engine replacement
DPF clogging	Yes	£200 – £800	Cleaning or forced regeneration is cost-effective
EGR valve/cooler failure	Yes	£400 – £1,200	Recall work may be available; out-of-warranty repair is still viable
Oil leaks (OFH/turbo)	Yes	£300 – £900	Affordable preventative maintenance
Boost leaks / turbo issues	Yes	£500 – £3,000	Viable if caught before turbo debris enters engine
Snapped timing chain (N57)	Usually No	Engine replacement	Piston-valve contact means little is left to repair

ProblemRepairable? · Typical Cost

N57 timing chain rattle (preventative)

Yes£1,500 – £3,500

Catch it early -far cheaper than engine replacement

DPF clogging

Yes£200 – £800

Cleaning or forced regeneration is cost-effective

EGR valve/cooler failure

Yes£400 – £1,200

Recall work may be available; out-of-warranty repair is still viable

Oil leaks (OFH/turbo)

Yes£300 – £900

Affordable preventative maintenance

Boost leaks / turbo issues

Yes£500 – £3,000

Viable if caught before turbo debris enters engine

Snapped timing chain (N57)

Usually NoEngine replacement

Piston-valve contact means little is left to repair

Buying This X4 30d? Check These First

Buy if:

Full service history with oil changes at 8,000–10,000 mile intervals (not BMW's extended CBS schedule)
N57 (2014–2018): no cold-start rattle -timing chain should be healthy
B57 (2018+): DPF health checked -regular motorway use is a good sign
No oil leaks from the oil filter housing or turbocharger
EGR cooler recall completed (check with BMW)

Avoid if:

No proof of regular oil changes -these engines are unforgiving of neglect
N57 with cold-start rattle -timing chain work is imminent and expensive
Any DPF or EGR warning lights -emissions system repairs can be costly
Oil leaks present -oil filter housing or turbo oil line may be failing
Any engine warning light without diagnosis -these engines can hide expensive faults

Closing verdict

The BMW X4 30d is the sweet spot in the X4 range -a silky-smooth straight-six diesel that delivers effortless performance and remarkable fuel economy. The N57-powered F26 generation offers proven performance but demands timing chain vigilance. The B57-powered G02 generation is a significant step forward in reliability and refinement, with the added benefit of mild-hybrid efficiency on later cars. Across both generations, one rule applies: oil-change discipline is everything. BMW's extended service intervals are widely considered inadequate -treat your X4 30d to 8,000–10,000 mile oil changes and it will reward you with hundreds of thousands of miles of effortless motoring.

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Buying Checklist

Before you buy a used BMW X4 30d (or before you commit to an engine replacement), check these:

1. Cold Start -Listen for rattle from the engine (N57 timing chain warning)
2. Service History -Including which engine era (N57/B57) and confirmed oil-change discipline (8k–10k miles max)
3. DPF Health -Any warning lights? Ask about regeneration frequency; urban cars will have more issues
4. EGR System -Any warning lights or loss of power? Check recall status
5. Oil Leaks -Check for oil around the oil filter housing and turbocharger
6. Boost Test -Any whistling or loss of power under acceleration?
7. Engine Warning Light -Have codes been read? Timing, DPF, EGR, or turbo codes are most common
8. MOT History -Check for emissions-related failures (DPF, EGR, NOx sensor issues)

Why this matters

A 10-minute check now can save you thousands later. The right X4 30d is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

Before you buy a used BMW X4 30d (or before you commit to an engine replacement), check these:

1
Cold Start -Listen for rattle from the engine (N57 timing chain warning)
2
Service History -Including which engine era (N57/B57) and confirmed oil-change discipline (8k–10k miles max)
3
DPF Health -Any warning lights? Ask about regeneration frequency; urban cars will have more issues
4
EGR System -Any warning lights or loss of power? Check recall status
5
Oil Leaks -Check for oil around the oil filter housing and turbocharger
6
Boost Test -Any whistling or loss of power under acceleration?
7
Engine Warning Light -Have codes been read? Timing, DPF, EGR, or turbo codes are most common
8
MOT History -Check for emissions-related failures (DPF, EGR, NOx sensor issues)

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common X4 30d pitfalls.

Engine Codes

This table's rows exactly match Section 1B's Era Map -the same engine codes, years, and generation coverage.

N57D30 (F26)

Years: 2014–2018
Power: 258 bhp (190 kW) @ 4,000 rpm · 560 Nm @ 1,500–3,000 rpm
2025 Enquiries: —(pattern data)[PATTERN DATA]
Avg. Recon Cost: £4,000–£7,500[PLACEHOLDER -confirm vs cost sheet]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
N57D30 (F26)	2014–2018	258 bhp (190 kW) @ 4,000 rpm · 560 Nm @ 1,500–3,000 rpm	—(pattern data)[PATTERN DATA]	£4,000–£7,500[PLACEHOLDER -confirm vs cost sheet]
B57D30 (G02)	2018–2022	261 bhp (195 kW) @ 4,000 rpm · 620 Nm @ 2,000–2,500 rpm	—(pattern data)[PATTERN DATA]	£4,500–£8,500[PLACEHOLDER -confirm vs cost sheet]
B57D30B (G02 LCI)	2022–present	286 bhp (210 kW) @ 4,000 rpm · 650 Nm @ 1,500 rpm	—(pattern data)[PATTERN DATA]	£5,000–£9,500[PLACEHOLDER -confirm vs cost sheet]

Technical SpecsCurrent B57D30B -G02 LCI

Displacement: 2,993cc
Cylinders: 6-cylinder inline, 24 valves, DOHC
Compression Ratio: 16.5:1
Fuel System: Common-rail direct injection
Turbocharger: Bi-turbo (twin-turbo)
Mild Hybrid: 48V system

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Market Intelligence

Real data from thousands of X4 30d enquiries in 2025.

Most Common Failure

DPF clogging and N57 timing chain wear -approximately 45% of X4 30d-related enquiries cite emissions or timing concerns

[PATTERN DATA]

Average Enquiry Mileage

50,000–80,000

miles

[PATTERN DATA]

Average Replacement Cost

£5,500

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

B57D30 -G02-era X4 30d is the most common X4 diesel on UK roads

[PATTERN DATA]

Peak Enquiry Season

Winter -cold starts expose timing chain and glow plug issues

[PATTERN DATA]

Regional Demand

South East: 22%
London: 18%
North West: 13%
Other Regions: 47%

[PATTERN DATA]

Regional Demand Breakdown

18%London22%South East13%North West47%Other Regions

Frequently Asked Questions

A reconditioned X4 30d engine typically costs £4,000–£9,500 supply only depending on generation. Fitting adds £1,000–£1,800 at independent specialist rates. Use our calculator for a figure specific to your car.

It depends on which generation you're asking about. The N57 (F26, 2014–2018) is generally reliable but timing chain wear and bottom-end bearing failures have been reported. The B57 (G02, 2018+) is widely regarded as reliable and efficient -a significant step forward -but DPF clogging, EGR system failures, and oil leaks are common. Across both, oil-change discipline is everything.

DPF clogging (the most common emissions-related issue across all generations), N57 timing chain wear (F26), EGR valve and cooler failures, oil leaks from the oil filter housing and turbocharger, and boost leaks/turbocharger issues. See the Era Map above for generation-specific advice.

Depends on vehicle value. Against a well-kept F26 X4 (values £8,000–£15,000+), a £4,500–£5,500 recon is 30–60% of the car's value -borderline but often worth it for a good example. Against a £15,000–£30,000 G02, a £5,000–£6,000 recon is 20–35% -worth it. The BMW scrap threshold of 70% means evaluating the whole vehicle and its condition before committing.

Listed on the VIN plate and vehicle documentation. As a rule of thumb: F26 (2014–2018) = N57D30; G02 (2018–2022) = B57D30; G02 LCI (2022–present) = B57D30B. Tell us your registration date and we'll confirm it for free.

Yes -if caught early. A preventative chain, tensioner and guide replacement costs £1,500–£3,500. However, if the chain snaps, a full engine replacement (£4,000–£7,500) is usually required. At the first sign of cold-start rattle, book an inspection immediately.

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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