BMW 8 Series 840i1993–presentM60 / M62 / B58

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Name: BMW 8 Series 840i UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

The 840i badge spans two distinct eras of BMW's grand tourer — the classic E31 V8 and the modern G14/G15/G16 B58 straight-six. Get quotes from trusted UK specialists today.

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20+Specialists

8 Series 840i Engines — from £1,000 to £8,500M60 / M62 / B58

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

BMW 8 Series 840i Engine Replacement Costs

Supply Only£2,500 – £7,500
Fitted (Indie)£3,500 – £9,000
Warranty12–24 months
Best ForMost owners — best cost/warranty balance

Engine Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£1,000 – £4,500	£1,800 – £6,000	1–6 months	Budget priority; older generations
Reconditioned Engine	£2,500 – £7,500	£3,500 – £9,000	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£3,500 – £8,500	£4,500 – £10,000	12–24 months	Long-term ownership; 3+ year horizon
Main Dealer New	£6,000 – £12,000 (where available)	£7,200 – £13,800	24–36 months	Insurance jobs, warranty claims

Figures above reflect the range across all generations; specific costs vary by era — see the Era Map above.

Labour estimate: Fitting an 840i engine typically takes 12–18 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

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Common Problems With BMW 8 Series 840i Engines

1. Nikasil Cylinder Liner Degradation(M60, E31 1993–1996)

Symptoms: Misfires, rough idle, loss of compression, increased oil consumption, engine warning light.
Typical Mileage: 60,000–100,000 miles
Repair Cost: £3,000–£6,000 (engine rebuild or replacement)
Replacement Cost: £3,000–£6,000 (full engine replacement)
Urgency: Check — book inspection urgently if misfires occur

Our recommendation:

The M60 V8's Nikasil cylinder liners can degrade when exposed to high‑sulphur fuel. If you experience misfires or rough running, have a compression test performed immediately. Many early M60 engines have been replaced; if yours hasn't, budget for a bottom‑end rebuild or replacement.

1. Nikasil Cylinder Liner Degradation(M60, E31 1993–1996)

Symptoms: Misfires, rough idle, loss of compression, increased oil consumption, engine warning light.
Typical Mileage: 60,000–100,000 miles
Repair Cost: £3,000–£6,000 (engine rebuild or replacement)
Replacement Cost: £3,000–£6,000 (full engine replacement)
Urgency: Check — book inspection urgently if misfires occur

Our recommendation:

2. Timing Chain Guide Failure(M62, E31 1996–1999)

Symptoms: Rattling noise on cold start, metallic ticking, engine warning light, loss of power.
Typical Mileage: 80,000–150,000 miles
Repair Cost: £1,500–£3,500 (chain guides and tensioner replacement)
Replacement Cost: N/A — repair only (if caught before chain jumps)
Urgency: Immediate — if you hear rattle, book an inspection today

Our recommendation:

The M62's timing chain guides are the defining weakness — they become brittle and can shatter, causing the chain to jump. If you hear a rattling noise on cold start, have the guides inspected immediately. Regular oil changes with the correct spec are essential. Many owners replace the guides preventatively around 100,000 miles.

3. Coolant Loss(B58, G14/G15/G16 2018+)

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 expansion tank/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.

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840i — 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
Nikasil liner degradation (M60)	Sometimes	£3,000 – £6,000	Often requires full rebuild; assess overall engine health
Timing chain guides (M62)	Yes	£1,500 – £3,500	Catch it early — before chain jumps
Coolant loss (B58)	Yes	£400 – £900	Routine maintenance — do preventatively
PCV valve failure (B58)	Yes	£400 – £800	Straightforward — replace valve
Severe engine damage	Usually No	Engine replacement	Little left to salvage — replacement is the only option

ProblemRepairable? · Typical Cost

Nikasil liner degradation (M60)

Sometimes£3,000 – £6,000

Often requires full rebuild; assess overall engine health

Timing chain guides (M62)

Yes£1,500 – £3,500

Catch it early — before chain jumps

Coolant loss (B58)

Yes£400 – £900

Routine maintenance — do preventatively

PCV valve failure (B58)

Yes£400 – £800

Straightforward — replace valve

Severe engine damage

Usually NoEngine replacement

Little left to salvage — replacement is the only option

Buying This 840i? Check These First

Buy if:

E31 M60: Nikasil liners replaced or compression test passed
E31 M62: timing chain guides replaced or inspected
G14/G15/G16 B58: cooling system maintained with recent water pump work
Full service history with BMW-spec oil for the correct era

Avoid if:

E31 M60: misfires or rough running — Nikasil may be degrading — walk away
E31 M62: cold‑start rattle — timing chain guides may be failing
G14/G15/G16 B58: coolant loss with no diagnosis — walk away
Engine warning light with no diagnosis — potentially expensive

Closing verdict

The 840i badge is a journey through BMW grand touring history — from the classic E31 V8 to the modern G14/G15/G16 B58 straight‑six. The E31 M62 is the most reliable V8; the B58 is the most refined and reliable overall. The M60 is the most maintenance‑sensitive. Buy on generation‑specific history — and never ignore a cold‑start rattle or coolant loss.

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Buying Checklist

Before you buy a used BMW 8 Series 840i (or before you commit to an engine replacement), check these:

1. Cold Start
Listen for rattling (M62 timing chain guides)
2. Misfires (E31 M60)
Check for rough running; Nikasil liner degradation indicator
3. Coolant Level (B58)
Check for unexplained loss; water pump may be failing
4. Service History
Including which generation (E31, G14/G15/G16 pre‑LCI or LCI) and confirmed maintenance
5. Oil Consumption
Does it use more than 1L per 1,000 miles?
6. PCV Valve (B58)
Check for rough idle; PCV failure indicator
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 8 Series 840i is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

Before you buy a used BMW 8 Series 840i (or before you commit to an engine replacement), check these:

1
Cold Start
Listen for rattling (M62 timing chain guides)
2
Misfires (E31 M60)
Check for rough running; Nikasil liner degradation indicator
3
Coolant Level (B58)
Check for unexplained loss; water pump may be failing
4
Service History
Including which generation (E31, G14/G15/G16 pre‑LCI or LCI) and confirmed maintenance
5
Oil Consumption
Does it use more than 1L per 1,000 miles?
6
PCV Valve (B58)
Check for rough idle; PCV failure indicator
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 8 Series 840i pitfalls.

Engine Codes

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

M60B40 (4.0 V8)

Years: 1993–1996
Power: 286 hp (213 kW) @ 5,800 rpm; 400 Nm @ 4,500 rpm
2025 Enquiries: —(pattern data)
Avg. Recon Cost: £1,500–£3,500[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
M60B40 (4.0 V8)	1993–1996	286 hp (213 kW) @ 5,800 rpm; 400 Nm @ 4,500 rpm	—(pattern data)	£1,500–£3,500[PLACEHOLDER]
M62B44 (4.4 V8)	1996–1999	286 hp (213 kW) @ 5,700 rpm; 420 Nm @ 3,900 rpm	—(pattern data)	£2,000–£4,000[PLACEHOLDER]
B58B30M1 (3.0 turbo I6)	2018–2022	333–340 hp (245–250 kW) @ 5,000–5,500 rpm; 500 Nm @ 1,600–4,500 rpm	—(pattern data)	£4,500–£7,500[PLACEHOLDER]
B58B30C (3.0 turbo I6)	2022–present	333–340 hp (245–250 kW) @ 5,000–6,250 rpm; 500 Nm @ 1,700–4,000 rpm	—(pattern data)	£5,000–£8,500[PLACEHOLDER]

Technical SpecsB58B30C 3.0 straight-six, G14/G15/G16 LCI

Displacement: 2,998 cc
Cylinders: 6-cylinder inline
Compression Ratio: 11.0:1
Fuel System: Direct injection
Turbocharger: Twin‑power turbo + 48V MHEV (select markets)

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Market Intelligence

Real data from thousands of 8 Series 840i enquiries in 2025.

Most Common Failure

E31 M60: Nikasil liner degradation; E31 M62: timing chain guides; B58: coolant system

[PATTERN DATA]

Average Enquiry Mileage

50,000–80,000

miles

[PATTERN DATA]

Average Replacement Cost

£4,000–£6,000

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine CodeB58B30M1 / B58B30C

60%

of 840i enquiries

[PATTERN DATA]

Peak Enquiry Season

Summer

Cooling issues exposed by warmer weather

[PATTERN DATA]

Regional Demand

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

[PATTERN DATA]

Regional Demand Breakdown

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

Frequently Asked Questions

A reconditioned 840i engine typically costs £2,500–£7,500 supply only depending on generation, with the E31 V8s lower and the B58 higher. Fitting adds £1,000–£1,800. Use our calculator for a figure specific to your 840i.

It depends which generation your 840i is. The E31 M62 is the most reliable V8 with timing chain guides as its main weakness. The B58 is widely regarded as one of BMW's most reliable modern engines. The E31 M60 is the most maintenance‑sensitive. Check the Era Map above for your specific car.

E31 M60: Nikasil liner degradation. E31 M62: timing chain guide failure. G14/G15/G16 B58: coolant loss (water pump, expansion cap), PCV valve failure, and oil filter housing leaks. Each generation has its own character and watchpoints.

Depends on vehicle value and generation. An E31 840i is a classic — values range from £8,000–£30,000, making replacement viable in many cases. A G14/G15/G16 840i is a £25,000–£60,000 vehicle — a £5,000–£7,000 recon is 8–28% of the car's value, making replacement a clear decision. Evaluate carefully based on your car's generation and condition.

Listed on the VIN plate and vehicle documentation. The 840i covers M60 (E31 1993–1996), M62 (E31 1996–1999), B58B30M1 (G14/G15/G16 2018–2022), and B58B30C (G14/G15/G16 LCI 2022+). Tell us your registration date and we'll confirm which one you have for free.

On E31 M60: use low‑sulphur fuel and have compression tested periodically. On E31 M62: timing chain guides replacement at 100,000 miles is recommended. On B58: regular coolant system checks, BMW‑spec oil changes, and PCV system inspections are the most effective prevention. At the first sign of rattle, 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 8 Series 840i Engine Replacement —Compare Prices &Get Quotes

BMW 8 Series 840i Engine Replacement Costs

Common Problems With BMW 8 Series 840i Engines

1. Nikasil Cylinder Liner Degradation(M60, E31 1993–1996)

2. Timing Chain Guide Failure(M62, E31 1996–1999)

3. Coolant Loss(B58, G14/G15/G16 2018+)

1. Nikasil Cylinder Liner Degradation(M60, E31 1993–1996)

2. Timing Chain Guide Failure(M62, E31 1996–1999)

3. Coolant Loss(B58, G14/G15/G16 2018+)

Weighing Your Options?

840i — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This 840i? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 8 Series 840i Owners Trust BMWEngines.uk

BMW 8 Series 840i Engine Replacement —Compare Prices &
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