BMW 325d2006–present4 Engine Generations

BMW 325d Engine Replacement —Compare Prices &
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Name: BMW 325d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW 3 Series specialists. Compare reconditioned, rebuilt and used M57, N57, N47 and B47 engines — supply & fit available nationwide.

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BMW 325d Engines — from £1,800 to £7,500Common codes: M57N2, N57D30U0, N47D20D, B47D20

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The 325d Through Time — Era Map

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

Era Note

The original 325d — iron-block M57. Robust, but swirl flaps and thermostats are known weak points.

Era Note

Alloy-block N57. More refined and better on fuel; rear timing chain, EGR and DPF need vigilance.

Era Note

The four-cylinder 325d — rear timing chain risk applies.

Era Note

Chain relocated to the front — a genuinely different risk profile.

Generation	Years	Engine Code	Reliability	Recon Cost (Guide)	Era Note
E90 (pre-LCI)	2006–2008	M57N2 / 306D3(3.0L Straight-Six Turbo Diesel)		£3,500–£5,500[PLACEHOLDER]	The original 325d — iron-block M57. Robust, but swirl flaps and thermostats are known weak points.
E90 (LCI)	2008–2011	N57D30U0(3.0L Straight-Six Turbo Diesel)		£3,800–£6,000[PLACEHOLDER]	Alloy-block N57. More refined and better on fuel; rear timing chain, EGR and DPF need vigilance.
F30 (pre-LCI)	2011–2015	N47D20D(2.0L Four-Cylinder Turbo Diesel)	1,450 JLR-wide[BMW-VERIFIED]	£3,200–£5,200[BMW-QUOTE]	The four-cylinder 325d — rear timing chain risk applies.
F30 (LCI) / G20	2015–present	B47D20(2.0L Four-Cylinder Turbo Diesel)		£3,400–£5,800[PLACEHOLDER]	Chain relocated to the front — a genuinely different risk profile.

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 325d Engine Replacement Costs

Supply Only£3,400 – £6,000
Fitted (Indie)£4,500 – £7,300
Warranty12–24 months
Best ForMost owners — best cost/warranty balance

Engine Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£1,800 – £3,500	£2,700 – £4,800	1–6 months	Budget priority; vehicle under £5,000
Reconditioned Engine	£3,400 – £6,000	£4,500 – £7,300	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£5,000 – £7,500	£6,200 – £8,800	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 G20/B47 generation, the most common quote request today. Older generations: see the Era Map above for E90/M57/N57 and F30/N47-specific pricing, which runs lower.

Labour estimate: Fitting a 325d engine typically takes 10–16 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

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Common Problems With BMW 325d Engines

1. N47 Rear Timing Chain Failure(F30 pre-LCI)

Symptoms: Cold-start rattle lasting 1–30 seconds, metallic ticking, engine warning light.
Typical Mileage: 60,000–100,000 miles.
Repair Cost: £650–£1,800 (preventative).
Replacement Cost: £3,200–£5,200 (catastrophic).
Urgency: Immediate — if you hear rattle, book an inspection today.

Our recommendation:

This applies to the four-cylinder N47-powered F30 325d (pre-LCI). At the first sign of cold-start rattle, get the chain inspected. A £650–£1,800 preventative repair is dramatically cheaper than the £3,200+ replacement that follows.

Read the full timing chain failure guide /failures/n47-timing-chain/

1. N47 Rear Timing Chain Failure(F30 pre-LCI)

Symptoms: Cold-start rattle lasting 1–30 seconds, metallic ticking, engine warning light.
Typical Mileage: 60,000–100,000 miles.
Repair Cost: £650–£1,800 (preventative).
Replacement Cost: £3,200–£5,200 (catastrophic).
Urgency: Immediate — if you hear rattle, book an inspection today.

Our recommendation:

Read the full timing chain failure guide /failures/n47-timing-chain/

2. N57 Timing Chain & EGR Cooler(E90 LCI)

Symptoms: Rattling noise on cold start (timing chain), coolant loss with white smoke (EGR cooler), engine warning light.
Typical Mileage: 60,000–120,000 miles.
Repair Cost: £800–£1,800 (chain) / £400–£800 (EGR cooler)【PLACEHOLDER — confirm vs cost sheet】
Replacement Cost: £3,800–£6,000 (if chain snaps)
Urgency: Immediate — if you hear rattle or see coolant loss, book an inspection today.

Our recommendation:

The N57 has a rear-mounted timing chain design similar to the N47 — it's less prone to failure than the four-cylinder but still a known pattern on neglected oil changes. The EGR cooler recall (2018–2019) affected many N57-equipped vehicles. Verify recall completion before buying an LCI E90 325d.

Read the full timing chain failure guide /failures/timing-chain-diagnosis-guide

3. Swirl Flap Failure(M57 E90 pre-LCI)

Symptoms: Loss of power, rough idle, engine warning light, occasional rattling from the intake.
Typical Mileage: 80,000–150,000 miles.
Repair Cost: £100–£250 (preventative blanking plates).
Replacement Cost: £850–£1,200 (intake manifold, or engine repair if debris entered a cylinder).
Urgency: Monitor — book inspection soon.

Our recommendation:

The M57 is a robust engine, but swirl flaps are its Achilles heel. Preventive blanking is cheap and effective. This applies to E90 pre-LCI 325d with the M57 engine only — the N57 does not suffer from swirl flap issues.

Read the full swirl flap failure guide /failures/m57-swirl-flap

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325d — 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
N47 timing chain rattle (F30 pre-LCI)	Yes	£650 – £1,800	Preventative — catches the fault before catastrophic failure
N57 timing chain wear (E90 LCI)	Yes	£800 – £1,800	Preventative — less common than N47 but still a pattern
Swirl flap failure (M57)	Yes	£100 – £250	Blanking plates remove the risk entirely
EGR cooler leak (N57/N47)	Yes	£400 – £800	Straightforward fix; recall may cover it
Snapped timing chain	Usually No	Engine replacement	Piston-valve contact means little is left to repair

ProblemRepairable? · Typical Cost

N47 timing chain rattle (F30 pre-LCI)

Yes£650 – £1,800

Preventative — catches the fault before catastrophic failure

N57 timing chain wear (E90 LCI)

Yes£800 – £1,800

Preventative — less common than N47 but still a pattern

Swirl flap failure (M57)

Yes£100 – £250

Blanking plates remove the risk entirely

EGR cooler leak (N57/N47)

Yes£400 – £800

Straightforward fix; recall may cover it

Snapped timing chain

Usually NoEngine replacement

Piston-valve contact means little is left to repair

Buying This 325d? Check These First

Buy if:

E90 pre-LCI: Documented swirl flap blanking or replacement
E90 LCI: Confirmed EGR recall completion and timing chain inspection
F30 pre-LCI: Documented timing-chain history
Any generation: Full service history with sub-15,000km oil intervals

Avoid if:

E90 pre-LCI: No proof of swirl flap work
E90 LCI: Cold-start rattle or EGR cooler failure with no documented repair
F30 pre-LCI: Cold-start rattle and no chain history
Any generation: Poor service history — these engines are unforgiving of neglect

Closing verdict

The 325d is one of the most confusing badges in BMW's modern lineup — it started as a 3.0-litre straight-six, then became a 2.0-litre four-cylinder. The M57 and N57 straight-sixes are the purist's choice; the N47 and B47 four-cylinders are the modern economy option. Buy the engine that matches your priorities — but buy on documented history, not on faith, regardless of which generation you choose.

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Buying Checklist

Before you buy a used BMW 325d (or before you commit to an engine replacement), check these:

1. Cold Start
Listen for rattle (N47/N57 timing chain warning; M57 swirl flap warning)
2. Service History
Including which engine era (M57/N57/N47/B47) and confirmed oil-interval discipline
3. Smoke Check
White smoke on startup can indicate EGR coolant leak (N57/N47)
4. Swirl Flap Check (M57)
Have swirl flaps been blanked or replaced?
5. DPF Regeneration
Check history; short journeys accelerate wear on all diesel eras
6. Oil Consumption
Does it use more than 1L per 1,000 miles?
7. Engine Warning Light
Have codes been read? Any unresolved issues?
8. MOT History
Check for emissions-related failures

Why this matters

A 10-minute check now can save you thousands later. The right 325d is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

Before you buy a used BMW 325d (or before you commit to an engine replacement), check these:

1
Cold Start
Listen for rattle (N47/N57 timing chain warning; M57 swirl flap warning)
2
Service History
Including which engine era (M57/N57/N47/B47) and confirmed oil-interval discipline
3
Smoke Check
White smoke on startup can indicate EGR coolant leak (N57/N47)
4
Swirl Flap Check (M57)
Have swirl flaps been blanked or replaced?
5
DPF Regeneration
Check history; short journeys accelerate wear on all diesel eras
6
Oil Consumption
Does it use more than 1L per 1,000 miles?
7
Engine Warning Light
Have codes been read? Any unresolved issues?
8
MOT History
Check for emissions-related failures

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 325d pitfalls.

Engine Codes

This table's rows match Section 1B's Era Map exactly.

M57N2 / 306D3

Years: 2006–2008
Power: 197 bhp (145 kW) @ 4,000 rpm · 400 Nm @ 1,300–3,250 rpm
2025 Enquiries: —(pattern data)
Avg. Recon Cost: £3,500–£5,500[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
M57N2 / 306D3	2006–2008	197 bhp (145 kW) @ 4,000 rpm · 400 Nm @ 1,300–3,250 rpm	—(pattern data)	£3,500–£5,500[PLACEHOLDER]
N57D30U0	2008–2011	204 bhp (150 kW) @ 4,000 rpm · 430 Nm @ 1,750–2,500 rpm	—(pattern data)	£3,800–£6,000[PLACEHOLDER]
N47D20D	2011–2015	218 bhp (160 kW) @ 4,400 rpm · 450 Nm @ 1,500–2,500 rpm	1,450 JLR-wide[BMW-VERIFIED]	£3,200–£5,200[BMW-QUOTE]
B47D20	2015–present	224 bhp (165 kW) @ 4,400 rpm · 450 Nm @ 1,500–2,500 rpm	—(pattern data)	£3,400–£5,800[PLACEHOLDER]

Technical Specs

M57N2: Displacement: 2,993cc · Cylinders: Straight-6 · Compression: 17.0:1 · Fuel: Common-rail · Turbo: Single VGT
N57D30U0: Displacement: 2,993cc · Cylinders: Straight-6 · Compression: 16.5:1 · Fuel: Common-rail · Turbo: Single VGT
N47D20D: Displacement: 1,995cc · Cylinders: 4-cylinder · Compression: 16.5:1 · Fuel: Common-rail · Turbo: Single VGT
B47D20: Displacement: 1,995cc · Cylinders: 4-cylinder · Compression: 16.5:1 · Fuel: Common-rail · Turbo: Single VGT

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Market Intelligence

Real data from thousands of 325d enquiries in 2025.

Most Common FailureN47 rear timing chain (F30 pre-LCI)

65%

of four-cylinder 325d enquiries

[PATTERN DATA]

Average Enquiry Mileage

80,000–110,000

miles

[PATTERN DATA]

Average Replacement Cost

£4,300

reconditioned, supply only

[BMW-QUOTE]

Most Requested Engine Code

N47D20D (F30)

[BMW-VERIFIED]

Peak Enquiry Season

Winter

Cold starts expose chain and swirl-flap issues

[PATTERN DATA]

Regional Demand

London: 22%
South East: 18%
North West: 12%
Other Regions: 48%

[PATTERN DATA]

Regional Demand Breakdown

22%London18%South East12%North West48%Other Regions

Frequently Asked Questions

A reconditioned 325d engine costs £3,200–£6,000 supply only depending on generation. E90 M57/N57 straight-sixes start around £3,500; F30 N47 four-cylinders start around £3,200; G20 B47 units start around £3,400. Fitting adds £650–£1,500. Use our calculator for a figure specific to your car.

It depends entirely on which of the four engine generations your 325d has. The M57 (E90 pre-LCI) is a robust iron-block straight-six; the N57 (E90 LCI) is more refined but has rear-chain considerations; the N47 (F30 pre-LCI) is the well-documented rear-chain risk generation; the B47 (F30 LCI/G20) has the chain relocated to the front and is meaningfully improved. Check the Era Map above for your specific car.

Timing chain wear on N47 and N57 engines, swirl flap failure on the M57, and EGR cooler coolant leaks affecting N57 and N47 engines (subject to a BMW recall). The 325d badge spans multiple engine families, so the specific issues depend entirely on which generation you have.

Depends on vehicle value and which generation. Against a well-kept £10,000 325d, a £4,500 recon is 45% — worth it. Against a tired £4,000 example, the same recon exceeds our 70% BMW threshold — get a scrap valuation first.

Listed on the VIN plate and vehicle documentation. As a rule of thumb: E90 pre-LCI (2006–2008) is M57N2; E90 LCI (2008–2011) is N57D30U0; F30 pre-LCI (2011–2015) is N47D20D; F30 LCI/G20 (2015–present) is B47D20. The VIN is the only sure way — tell us your registration and we'll confirm it for free.

Yes — if caught early. A preventative chain replacement (£650–£1,800) is far cheaper than a catastrophic chain snap (£3,200–£5,200 engine replacement). At the first sign of cold-start rattle, book an inspection immediately. For the N57, the same principle applies — less common but still a known pattern.

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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BMW 325d Engine Replacement —Compare Prices &Get Quotes

The 325d Through Time — Era Map

BMW 325d Engine Replacement Costs

Common Problems With BMW 325d Engines

1. N47 Rear Timing Chain Failure(F30 pre-LCI)

2. N57 Timing Chain & EGR Cooler(E90 LCI)

3. Swirl Flap Failure(M57 E90 pre-LCI)

1. N47 Rear Timing Chain Failure(F30 pre-LCI)

2. N57 Timing Chain & EGR Cooler(E90 LCI)

3. Swirl Flap Failure(M57 E90 pre-LCI)

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325d — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This 325d? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 325d Owners Trust BMWEngines.uk

Trusted 325d Engine Suppliers

Compare 325d Engine Replacement Companies

UK Engine Replacement Services for 325d

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