How much does a BMW 440i engine replacement cost in the UK?

A reconditioned B58 3.0-litre engine typically costs £4,500–£7,500 supply only. Used engines are available from £3,500–£5,500. Fitting adds £1,200–£1,800 depending on your location and workshop. Main dealer new engines can exceed £10,000.

Is the BMW 440i engine reliable?

Yes - the B58 is widely considered one of BMW's most reliable modern engines. It's a significant step forward from the N55, with improved cooling, durability, and reduced friction. However, it has known weak points: oil filter housing leaks, water pump failures, PCV diaphragm issues, and - on early models - plastic oil pump components. Regular maintenance is essential.

What are the common problems with the BMW 440i?

The most frequently reported issues are oil filter housing leaks (plastic housing cracks, causing oil and coolant to mix), water pump and thermostat failures, PCV valve diaphragm failure (causing rough idle and smoke), and VANOS solenoid wear. Early B58 engines (pre-2020) also had plastic oil pump components that could fail catastrophically.

Is it worth replacing a BMW 440i engine, or should I scrap the car?

Depends on vehicle value and which component has failed. Against a well-kept £25,000 440i, a £6,000 recon is 24% - worth it. Against a tired £10,000 example, the same recon approaches our 70% BMW threshold - get a scrap valuation first.

How do I find my BMW 440i engine code?

Listed on the VIN plate and vehicle documentation. The 440i carries the engine code B58B30M0 (pre-LCI) or B58B30O1 (LCI models). Both are 3.0-litre straight-six turbo petrol engines. The B58 is part of BMW's modular engine family.

Can I repair the oil filter housing leak, or does it need full engine replacement?

Yes - oil filter housing replacement is a well-understood repair costing £500–£1,200. The housing is made of plastic and is prone to cracking. If the housing fails, oil and coolant can mix, leading to catastrophic engine damage. An aftermarket metal housing upgrade is available for a permanent fix. If you notice oil spots or a burning smell, have it inspected immediately.

BMW 440i2016–20203.0L Straight-Six Turbo (B58)

BMW 440i Engine Replacement — Compare Prices & Get Quotes

Name: BMW 440i UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW 4 Series specialists. Compare reconditioned, rebuilt and used B58 3.0-litre turbo engines - supply & fit available nationwide.

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BMW 440i Engines - from £3,500 to £10,500Common code: B58B30M0 / B58B30O1

BMW 440i Engines - from £3,500 to £10,500· Common code: B58B30M0 / B58B30O1

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The 440i THROUGH TIME - Era Map

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

Era Note

One engine throughout this badge's history - no era ambiguity.

GenerationYearsEngine CodeReliabilityRecon CostEra Note

F32/F33/F36 440i BMW 320d F32/F33/F36 440i

2016–2020B58B30M0 / B58B30O1 (3.0L Straight-Six Turbo)★★★★☆ [NEWLY ASSIGNED - see Data Note]£4,500–£7,500 [PLACEHOLDER - confirm vs cost sheet]One engine throughout this badge's history - no era ambiguity.

Why use this era map?

This table is the single source every other section on this page matches - Sections 2, 4 and 6 reference it rather than restating conflicting figures.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

BMW 440i Engine Replacement Costs

Supply Only£4,500–£7,500

Fitted (Indie)£5,800–£9,000

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£3,500–£5,500£4,700–£7,0001–6 monthsBudget priority; lower-mileage examples

Reconditioned Engine£4,500–£7,500£5,800–£9,00012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£6,000–£9,500£7,300–£11,00012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£9,000–£14,000+£10,500–£16,000+24–36 monthsInsurance jobs, warranty claims

Figures above reflect the B58 3.0-litre turbo petrol engine. Used engines are available from approximately £3,500–£5,500, with reconditioned units ranging from £4,500–£7,500. Newer B58 engines typically sit in the £5,500–£7,500 band.

Labour estimate: Fitting a 440i engine typically takes 12–16 hours at £70–£100/hr (independent) or £120–£180/hr (London/SE dealer).

→ Compare 440i engine prices from UK specialists

Common Problems With BMW 320d Engines

1. Oil Filter Housing Leaks

Symptoms: Oil spots under the car, burning oil smell from the engine bay, low oil level warning, visible oil residue around the oil filter housing area.

Typical mileage: 60,000–100,000 miles (around 8 years)

Repair cost: £500–£1,200 (oil filter housing replacement)【PLACEHOLDER - confirm vs cost sheet】

Replacement cost: N/A - repair only

🟠 Check - book inspection urgently

Our recommendation:

The B58's oil filter housing is made of plastic and is prone to cracking and leaking. If the housing fails, oil and coolant can mix - a potentially catastrophic failure. If you notice oil spots or a burning smell, have the oil filter housing inspected promptly. An aftermarket metal housing upgrade is available.

Read the full oil leak guide

1. Oil Filter Housing Leaks

Symptoms: Oil spots under the car, burning oil smell from the engine bay, low oil level warning, visible oil residue around the oil filter housing area.

Typical mileage: 60,000–100,000 miles (around 8 years)

Repair cost: £500–£1,200 (oil filter housing replacement)【PLACEHOLDER - confirm vs cost sheet】

Replacement cost: N/A - repair only

🟠 Check - book inspection urgently

Our recommendation:

Read the full oil leak guide

2. Water Pump & Cooling System Failures

Symptoms: Coolant loss, overheating, temperature gauge fluctuations, engine warning light, sweet smell from the engine bay.

Typical mileage: 40,000–80,000 miles

Repair cost: £400–£900 (water pump replacement)【PLACEHOLDER - confirm vs cost sheet】

Replacement cost: N/A - repair only

🟠 Check - book inspection urgently

Our recommendation:

The B58's water pump and thermostat are prone to premature failure. The plastic impellers wear out faster than metal ones. If you're experiencing coolant loss or overheating, have the cooling system inspected promptly. An upgraded water pump with metal impellers improves reliability.

Read the full coolant leak guide

3. PCV Valve Diaphragm Failure

Symptoms: Rough idle, whistling noise from the engine, white or blue smoke from exhaust on startup, oil in the intake/chargepipe, misfires.

Typical mileage: 40,000–80,000 miles

Repair cost: £200–£500 (PCV diaphragm repair kit)【PLACEHOLDER - confirm vs cost sheet】

Replacement cost: N/A - repair only

🟡 Monitor - book inspection soon

Our recommendation:

The PCV diaphragm on first-generation B58 engines can tear, causing high crankcase vacuum and smoking. The good news is this is easily fixed with an affordable repair kit. If you notice rough idle, whistling, or smoke on startup, have the PCV system inspected.

Read the full PCV failure guide

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440i - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

440i - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseOil filter housing leak✅ Yes£500–£1,200Well-understood fix; aftermarket metal housing availableWater pump failure✅ Yes£400–£900Straightforward fix; upgraded metal impeller availablePCV diaphragm failure✅ Yes£200–£500Affordable repair kit; far cheaper than valve cover replacementVANOS solenoid wear✅ Yes£200–£500Simple repair; part of routine maintenanceOil pump failure (early B58)⚠️ Sometimes£1,500–£3,000Early plastic oil pumps can fail catastrophically; 2020+ models switched to metal

Buying This 440i? Check These First

Buy If

Full BMW service history with evidence of regular oil changes using BMW LL-01 approved oil
Post-2020 build (metal oil pump fitted from factory)
No coolant loss or overheating history
No rough idle, whistling, or smoke on startup

Avoid If

Oil leaks with no documented oil filter housing inspection or replacement
Coolant loss with no cooling system service records
Rough idle or whistling from the engine (PCV diaphragm warning)
Engine warning light with no diagnosis

Closing Verdict

The 440i's B58 is one of BMW's finest modern engines - a genuinely robust, powerful, and tunable straight-six that represents a significant step forward from the N55. It's not bulletproof - oil filter housing leaks, water pump failures, and PCV diaphragm issues are the price of entry - but these are well-understood, manageable fixes. Buy on documented history, not on faith. A well-maintained 440i is a £20,000–£35,000 future classic; a neglected one is a £7,000 engine replacement waiting to happen.

Don't guess.Get the right engine at the right price.

→ Compare 440i engine prices before you buy

Don't Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 320d.

→ Compare 440i engine prices before you buy

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Buying Checklist

Before you buy a used BMW 440i (or before you commit to an engine replacement), check these:

Cold Start

Listen for rough idle, whistling, or smoke (PCV diaphragm warning)

Service History

including the B58 era (2016–2020) and confirmed oil-change intervals using BMW LL-01 approved oil

Oil Leak Check

Any history of oil leaks? (oil filter housing is a known weak point)

Coolant Check

Any history of coolant loss or water pump/thermostat replacement?

Smoke Check

White or blue smoke on startup can indicate PCV or turbo issues

VANOS Operation

Any hesitation, rough idle, or loss of power? (VANOS solenoid warning)

Engine Warning Light

Have codes been read? Any unresolved VANOS, cooling system, or PCV issues?

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 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

BMW 320d Engine Codes

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

B58B30M0 / B58B30O1 (3.0L Straight-Six Turbo)

Years2016–2020

Power326–340 PS (240–250 kW) @ 5,000–6,500 rpm · 500 Nm @ 1,600–4,500 rpm

2025 Enquiries- (pattern data)

Avg. Recon Cost£4,500–£7,500 [PLACEHOLDER - confirm vs cost sheet]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

B58B30M0 / B58B30O1 (3.0L Straight-Six Turbo)2016–2020326–340 PS (240–250 kW) @ 5,000–6,500 rpm · 500 Nm @ 1,600–4,500 rpm- (pattern data)£4,500–£7,500 [PLACEHOLDER - confirm vs cost sheet]

Technical Specs

B58B30M0 / B58B30O1

Displacement2,998 cc

CylindersStraight-6, 4 valves per cylinder, DOHC

Compression Ratio10.2:1

Fuel SystemDirect injection

TurbochargerSingle twin-scroll turbocharger with air-to-liquid intercooler

ValvetrainVALVETRONIC with Double VANOS

→ Compare 440i engine prices for your BMW

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Market Intelligence

Most Common Failure

Oil filter housing leaks

the B58's most notable weakness

Average Enquiry Mileage

55,000

–85,000 miles

[PATTERN DATA]

Average Replacement Cost

£4,500

–£7,500 reconditioned, supply only

[PLACEHOLDER - confirm vs cost sheet]

Most Requested Engine Code

B58B30M0 / B58B30O1

[PATTERN DATA]

Peak Enquiry Season

Winter

cold starts expose PCV and cooling system issues【PATTERN DATA】

Regional Demand

London20%

South East18%

North West12%

PATTERN DATA

Regional Demand Breakdown

20%London

18%South East

12%North West

BMW 320d - Frequently Asked Questions

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.

Why UK BMW 440i Owners Trust BMWEngines.uk

Trusted 440i B58 Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real 440i owners, as part of the Engine Finders network, covering the entire F32/F33/F36 B58 era from 2016 to 2020.
Compare 440i Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit, across every 4 Series that left the factory with this powerful 3.0-litre straight-six.
UK Engine Replacement Services for 440i
supply-only or full supply & fit available nationwide, covering the full F32/F33/F36 production run - and we're vetted across every era of this badge.

Find the best BMW 440i engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get your 4 Series back on the road with confidence.

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No hidden fees

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Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available