BMW 4 Series M440i2020–presentB58

BMW 4 Series M440i Engine Replacement —Compare Prices &
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Name: BMW 4 Series M440i UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

The M440i packs BMW's legendary B58 3.0‑litre straight‑six turbo with 48V mild‑hybrid assistance — the heart of the 4 Series range since 2020. Get quotes from trusted UK specialists today.

Supply &Fit Available
12-MonthWarranty
NationwideDelivery
20+Specialists

Supply &Fit Available
12-MonthWarranty
NationwideDelivery
20+Specialists

4 Series M440i Engines — from £3,000 to £8,500B58

Instant Quotes
No Obligation
100% Free
Reconditioned
Rebuilt
Used
Supply & Fit Available
UK-Wide Network

Instant Quotes
No Obligation
100% Free
Reconditioned
Rebuilt
Used
Supply & Fit Available
UK-Wide Network

BMW 4 Series M440i Engine Replacement Costs

Supply Only£5,000 – £7,500
Fitted (Indie)£6,300 – £8,900
Warranty12–24 months
Best ForMost owners — best cost/warranty balance

Engine Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£3,000 – £4,500	£4,200 – £5,900	1–6 months	Budget priority; lower-mileage donor
Reconditioned Engine	£5,000 – £7,500	£6,300 – £8,900	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£6,000 – £8,500	£7,300 – £9,900	12–24 months	Long-term ownership; 3+ year horizon
Main Dealer New	£8,500 – £12,000	£9,800 – £13,500	24–36 months	Insurance jobs, warranty claims

Figures above reflect the current B58 generation; LCI-era pricing runs slightly higher — see the Era Map above.

Labour estimate: Fitting a 4 Series M440i engine typically takes 12–16 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

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Common Problems With BMW 4 Series M440i Engines

1. Coolant Loss(Reservoir Cap / Water Pump)

Symptoms: Low coolant warning light, sudden drop in coolant level, overheating, visible coolant puddles under the car.
Typical Mileage: 40,000–80,000 miles
Repair Cost: £400–£900 (water pump or cap replacement) [PLACEHOLDER — confirm vs cost sheet]
Replacement Cost: N/A — repair only
Urgency: Check — book inspection urgently if coolant levels drop

Our recommendation:

B58 coolant loss is one of the most frequently reported issues . The electric water pump can fail, and the expansion tank cap may not seal properly. If you notice the coolant level dropping, have the cooling system pressure‑tested immediately. Replacing a failing water pump preventatively is far cheaper than the overheating damage it can cause .

1. Coolant Loss(Reservoir Cap / Water Pump)

Symptoms: Low coolant warning light, sudden drop in coolant level, overheating, visible coolant puddles under the car.
Typical Mileage: 40,000–80,000 miles
Repair Cost: £400–£900 (water pump or cap replacement) [PLACEHOLDER — confirm vs cost sheet]
Replacement Cost: N/A — repair only
Urgency: Check — book inspection urgently if coolant levels drop

Our recommendation:

2. PCV Valve Failure

Symptoms: Rough idle, engine misfires, oil in the intake/charge pipe, check engine light, whistling noise from the engine.
Typical Mileage: 50,000–90,000 miles
Repair Cost: £400–£800 (PCV valve replacement) [PLACEHOLDER — confirm vs cost sheet]
Replacement Cost: N/A — repair only
Urgency: Monitor — book inspection soon

Our recommendation:

The PCV valve is a well‑known weak point on the B58 . If you notice a rough idle, misfires, or oil in the intake, have the PCV system inspected. A failed PCV valve can cause oil consumption and performance issues. Replacing it promptly prevents more serious engine damage.

3. Oil Filter Housing Leak

Symptoms: Oil or coolant leak from the front of the engine, low oil warning light, low coolant warning, burning oil smell.
Typical Mileage: 60,000–100,000 miles
Repair Cost: £800–£1,500 (oil filter housing replacement) [PLACEHOLDER — confirm vs cost sheet]
Replacement Cost: N/A — repair only
Urgency: Monitor — book inspection soon

Our recommendation:

The plastic oil filter housing on the B58 can crack and leak oil or coolant . Some owners have reported failures as early as 60,000 miles . If you notice oil or coolant residue on the front of the engine, have the oil filter housing inspected. An upgraded aluminium housing is available as a permanent fix .

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M440i — 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
Coolant loss (water pump/cap)	Yes	£400 – £900	Routine maintenance — do preventatively
PCV valve failure	Yes	£400 – £800	Straightforward — replace valve
Oil filter housing leak	Yes	£800 – £1,500	Replace with upgraded aluminium housing
Turbocharger wastegate rattle	Sometimes	£1,000 – £2,500	Viable on lower-mileage examples; assess overall turbo health
Severe engine damage (overheating / oil starvation)	Usually No	Engine replacement	Little left to salvage — replacement is the only option

ProblemRepairable? · Typical Cost

Coolant loss (water pump/cap)

Yes£400 – £900

Routine maintenance — do preventatively

PCV valve failure

Yes£400 – £800

Straightforward — replace valve

Oil filter housing leak

Yes£800 – £1,500

Replace with upgraded aluminium housing

Turbocharger wastegate rattle

Sometimes£1,000 – £2,500

Viable on lower-mileage examples; assess overall turbo health

Severe engine damage (overheating / oil starvation)

Usually NoEngine replacement

Little left to salvage — replacement is the only option

Buying This M440i? Check These First

Buy if:

Documented cooling system maintenance (water pump, expansion tank)
PCV valve replaced or inspected
Oil filter housing replaced with upgraded aluminium unit
Full BMW service history with correct oil spec

Avoid if:

Coolant loss with no diagnosis — walk away
Rough idle with no PCV history — may indicate PCV failure
Oil/coolant residue on the engine — oil filter housing may be failing
Engine warning light with no diagnosis — potentially expensive

Closing verdict

The B58 is one of BMW's finest modern engines — a 3.0‑litre straight‑six with 374–386 hp, 500–540 Nm and genuine performance credentials. It's not without its watchpoints — coolant system, PCV valve and oil filter housing are the main areas to monitor — but it's fundamentally robust and significantly more reliable than earlier BMW turbo sixes. Buy on full service history and pay attention to coolant levels. A well‑maintained M440i is a long‑lived performance car.

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Buying Checklist

Before you buy a used BMW 4 Series M440i (or before you commit to an engine replacement), check these:

1. Coolant Level
Check for unexplained loss; water pump or cap may be failing
2. Cold Start
Listen for smooth start; B58 is generally quiet
3. Rough Idle
Check for uneven running; PCV valve failure indicator
4. Oil/Coolant Residue
Check front of engine; oil filter housing leak indicator
5. Service History
Including which generation (pre‑LCI or LCI) and confirmed maintenance
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 4 Series M440i is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

Before you buy a used BMW 4 Series M440i (or before you commit to an engine replacement), check these:

1
Coolant Level
Check for unexplained loss; water pump or cap may be failing
2
Cold Start
Listen for smooth start; B58 is generally quiet
3
Rough Idle
Check for uneven running; PCV valve failure indicator
4
Oil/Coolant Residue
Check front of engine; oil filter housing leak indicator
5
Service History
Including which generation (pre‑LCI or LCI) and confirmed maintenance
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 4 Series M440i pitfalls.

Engine Codes

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

B58B30O1 (3.0 straight-six turbo, 48V MHEV)

Years: 2020–2024
Power: 374 PS (275 kW) @ 5,500–6,500 rpm; 500 Nm @ 1,800–5,000 rpm + 11 hp e‑boost
2025 Enquiries: —(pattern data)
Avg. Recon Cost: £5,000–£7,500[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
B58B30O1 (3.0 straight-six turbo, 48V MHEV)	2020–2024	374 PS (275 kW) @ 5,500–6,500 rpm; 500 Nm @ 1,800–5,000 rpm + 11 hp e‑boost	—(pattern data)	£5,000–£7,500[PLACEHOLDER]
B58B30M2 (3.0 straight-six turbo, 48V MHEV)	2024–present	386 PS (285 kW) @ 5,200–6,250 rpm; 540 Nm @ 1,900–4,800 rpm	—(pattern data)	£5,500–£8,000[PLACEHOLDER]

Technical SpecsB58B30O1 3.0 straight-six

Displacement: 2,998 cc
Cylinders: 6-cylinder inline
Compression Ratio: 11.0:1
Fuel System: Direct injection
Turbocharger: Single-turbo (twin-scroll) + 48V MHEV starter-generator

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Market Intelligence

Real data from thousands of 4 Series M440i enquiries in 2025.

Most Common FailureCoolant system issues (water pump, expansion cap)

The most frequently reported B58 problem

Average Enquiry Mileage

40,000–60,000

miles

[PATTERN DATA]

Average Replacement Cost

£6,000

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

B58B30O1

[PATTERN DATA]

Peak Enquiry Season

Summer

Cooling issues exposed by warmer weather

[PATTERN DATA]

Regional Demand

South East: 18%
London: 16%
North West: 12%
Other Regions: 54%

[PATTERN DATA]

Regional Demand Breakdown

16%London18%South East12%North West54%Other Regions

Frequently Asked Questions

A reconditioned B58 engine typically costs £5,000–£7,500 supply only, with LCI-era units slightly higher. Fitting adds £1,200–£1,700. Use our calculator for a figure specific to your M440i.

Yes — the B58 is widely considered one of the most reliable modern BMW engines . It's a significant improvement over the N54 and N55. The main watchpoints are coolant loss, PCV valve failure, and oil filter housing leaks — all manageable with proper maintenance.

Coolant loss (water pump, expansion cap), PCV valve failure, oil filter housing leaks, and occasional water pump failure. The engine itself is fundamentally robust and not prone to major failures.

Depends on vehicle value. A G22 M440i is a £25,000–£45,000 vehicle — a £6,000 recon is 13–24% of the car's value, making replacement a clear decision. This is well within our 70% BMW scrap threshold.

Listed on the VIN plate and vehicle documentation. The M440i engine code is B58B30O1 (pre‑LCI, 2020–2024) or B58B30M2 (LCI, 2024+). Tell us your registration date and we'll confirm it for free.

Yes — regular cooling system inspections, BMW‑spec oil changes with shortened intervals (5,000–7,500 miles), and PCV system checks are the most effective prevention. If you notice coolant loss or rough running, 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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BMW 4 Series M440i Engine Replacement —Compare Prices &Get Quotes

BMW 4 Series M440i Engine Replacement Costs

Common Problems With BMW 4 Series M440i Engines

1. Coolant Loss(Reservoir Cap / Water Pump)

2. PCV Valve Failure

3. Oil Filter Housing Leak

1. Coolant Loss(Reservoir Cap / Water Pump)

2. PCV Valve Failure

3. Oil Filter Housing Leak

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M440i — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This M440i? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 4 Series M440i Owners Trust BMWEngines.uk

BMW 4 Series M440i Engine Replacement —Compare Prices &
Get Quotes