How much does a BMW 8 Series 840Ci engine replacement cost in the UK?

A reconditioned 840Ci engine typically costs £2,200–£6,500 supply only depending on generation. M60-era engines sit at the lower end (£2,200–£5,500), while M62 units run £2,500–£6,500. Fitting adds £900–£2,000 depending on workshop location. A total replacement cost for a new BMW engine can fall within £7,500–£9,500+. Use our calculator for a figure specific to your car.

Is the BMW 8 Series 840Ci engine reliable?

It depends on which of the two engine generations your 840Ci has. The M60 (1992–1996) is notorious for the Nikasil bore lining issue - high-sulfur fuel caused premature wear. Most affected engines were replaced under warranty. The M62 (1996–1999) uses Alusil liners and resolves this issue, but timing chain guide failure is a known problem. Both engines suffer from cooling system failures and oil leaks. Check the Era Map above for your specific car.

What are the common problems with the BMW 8 Series 840Ci?

Nikasil bore wear on the M60 (pre-1996) - compression loss, oil consumption, rough running. Timing chain guide failure on the M62 (post-1996) - rattling, 'slap' noise, plastic debris in oil. Cooling system failures on both engines - radiator leaks, water pump failure. Oil leaks from valve cover and timing cover gaskets.

Is it worth replacing a BMW 8 Series 840Ci engine, or should I scrap the car?

Apply the 70% BMW scrap threshold: if your 840Ci is worth £6,000 and a recon engine is £4,000 (67%), it's borderline. If the vehicle is a tired £4,500 example, the same engine exceeds 70% - get a scrap valuation first. The 840Ci's classic car status and enthusiast following often justify replacement spend if the rest of the car is in good condition.

How do I find my BMW 8 Series 840Ci engine code?

Listed on the VIN plate and vehicle documentation. As a rule of thumb: 1992–1996 is M60B40 (4.0L V8), 1996–1999 is M62B44 (4.4L V8). The 840Ci was fitted to the E31 chassis. Tell us your registration date and we'll confirm it for free.

840Ci Engine Replacement Cost UK

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

The 840Ci THROUGH TIME - Era Map

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

Era Note

Nikasil lining is the critical weakness - verify block type

GenerationYearsEngine CodeReliabilityRecon CostEra Note

E31 (early) BMW 320d E31 (early)

1992–1996M60B40★★★½☆ [NEWLY ASSIGNED - see Data Note]£2,200–£5,500 [PLACEHOLDER - confirm vs cost sheet]Nikasil lining is the critical weakness - verify block type

E31 (late) BMW 320d E31 (late)

1996–1999M62B44★★★★☆ [NEWLY ASSIGNED - see Data Note]£2,500–£6,500 [PLACEHOLDER - confirm vs cost sheet]Alusil block resolves Nikasil - timing chain guides are main concern

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 8 Series 840Ci Engine Replacement Costs

Supply Only£2,200–£5,500

Fitted (Indie)£3,200–£7,000

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£1,200–£2,800£2,000–£4,2001–6 monthsBudget priority; short-term ownership

Reconditioned Engine£2,200–£5,500£3,200–£7,00012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£3,500–£6,500£4,500–£8,00012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer NewN/AN/AN/ANo longer available - specialist reconditioning is the route

Figures above reflect both M60 and M62 engine generations. See the Era Map above for era-specific pricing. A total replacement cost for a new BMW engine can fall within £7,500–£9,500+, though reconditioned units are significantly more affordable.

Labour estimate: Fitting an 840Ci engine typically takes 14–20 hours at £65–£95/hr (independent). The V8's tight engine bay and complex electronics add significant labour time. Parts for the 8 Series can be hard to find and expensive.

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Common Problems With BMW 320d Engines

1. Nikasil Cylinder Liner Wear (M60B40 - 1992–1996)

Symptoms: Loss of compression, excessive oil consumption, black exhaust smoke, rough running, misfires, eventual engine failure.

Typical mileage: 60,000–120,000 miles - high-sulfur fuel accelerates wear.

Repair cost: £2,000–£5,000 (engine replacement with Alusil block).

Replacement cost: N/A - repair only; if ignored, compression loss makes the engine undriveable.

🟠 Check - book inspection urgently if symptoms appear.

Our recommendation:

The M60's Nikasil cylinder lining is its fatal flaw. High-sulfur gasoline in the 1990s reacted with the coating, causing bore wear. BMW later switched to Alusil blocks, which are durable. A compression test is essential before buying any early 840Ci. If you experience oil consumption or rough running, have the engine inspected immediately. Most surviving engines have been replaced with Alusil units - verify your car's history.

1. Nikasil Cylinder Liner Wear (M60B40 - 1992–1996)

Symptoms: Loss of compression, excessive oil consumption, black exhaust smoke, rough running, misfires, eventual engine failure.

Typical mileage: 60,000–120,000 miles - high-sulfur fuel accelerates wear.

Repair cost: £2,000–£5,000 (engine replacement with Alusil block).

Replacement cost: N/A - repair only; if ignored, compression loss makes the engine undriveable.

🟠 Check - book inspection urgently if symptoms appear.

Our recommendation:

The M60's Nikasil cylinder lining is its fatal flaw. High-sulfur gasoline in the 1990s reacted with the coating, causing bore wear. BMW later switched to Alusil blocks, which are durable. A compression test is essential before buying any early 840Ci. If you experience oil consumption or rough running, have the engine inspected immediately. Most surviving engines have been replaced with Alusil units - verify your car's history.

2. Timing Chain Guide Failure (M62B44 - 1996–1999)

Symptoms: Rattling or "slap" noise from the engine, excessive vibration, plastic particles in the oil, check engine light.

Typical mileage: 80,000–100,000 miles.

Repair cost: £1,200–£3,000 (chain, guides, tensioners).

Replacement cost: N/A - repair only if caught early; if the chain jumps, piston-valve contact can destroy the engine.

🔴 Immediate - if you hear rattling, book an inspection today.

Our recommendation:

The M62's timing chain guides are a main failure point. The plastic guides become brittle with age and break, sending debris into the oil system. If the chain jumps timing, it can cause catastrophic engine damage. A timing chain kit for the M62 includes guides, tensioners, and chains. At the first sign of rattling, book an inspection immediately - preventative replacement is far cheaper than a full engine rebuild.

3. Cooling System Failures (M60 & M62)

Symptoms: Sudden coolant leaks, frequent need to top up coolant, engine overheating, unstable temperature, audible bearing noise from water pump.

Typical mileage: 60,000–100,000 miles - age-related as plastic components become brittle.

Repair cost: £200–£800 (radiator, water pump, thermostat, hoses).

Replacement cost: N/A - repair only; ignoring coolant warnings can lead to head gasket failure.

🔴 Immediate - if the coolant warning comes on, pull over immediately.

Our recommendation:

The cooling system on both M60 and M62 engines relies on plastic components - radiator end tanks, hose flanges, and thermostat housings - that become brittle with age. The water pump impeller can also fail. Neglecting the cooling system can lead to catastrophic overheating. If you see any coolant warnings, have the system inspected immediately.

8 Series 840Ci - 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.

8 Series 840Ci - 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 SenseNikasil bore wear (M60)⚠️ Sometimes£2,000–£5,000Replace with Alusil block - resolves permanentlyTiming chain guide failure (M62)✅ Yes (if caught early)£1,200–£3,000Preventative - catches fault before catastrophic failureCooling system failure✅ Yes£200–£800Simple fix - do it immediately to avoid head gasket failureOil leaks (valve cover, timing cover)✅ Yes£300–£1,000Common maintenance - repair when symptoms appearCatastrophic engine failure❌ Usually NoEngine replacementFull engine replacement required if bottom-end or valvetrain fails

Buying This 840Ci? Check These First

Buy If

Post-1996 M62 with Alusil block - Nikasil issue resolved
M60 with documented Alusil replacement or confirmed healthy compression test
Full service history with regular maintenance
Timing chain guides replaced on M62 (especially over 80,000 miles)

Avoid If

Pre-1996 M60 without compression test - Nikasil bore wear can be a £5,000 surprise
Rattling or "slap" from the engine - timing chain guide failure on M62
Coolant leaks or overheating - cooling system failure
Poor service history - these engines need regular maintenance

Closing Verdict

The 840Ci is a classic grand tourer that deserves careful ownership. The early M60 V8 is a brilliant engine but the Nikasil issue is a critical weak point - verify the block type before purchase. The later M62 is more reliable but timing chain guides are a known failure point. Both engines suffer from ageing cooling systems and oil leaks. With the 70% BMW scrap threshold, a £4,000 recon on a £6,000 840Ci is 67% - borderline. On a sub-£5,000 example, think carefully. The 840Ci is considered the better overall value versus the V12 850Ci.

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BMW 320d Engine Codes

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

M60B40

Years1992–1996

Power282 hp (210 kW)

2025 Enquiries- (pattern data)

Avg. Recon Cost£2,200–£5,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

M60B401992–1996282 hp (210 kW)- (pattern data)£2,200–£5,500 [PLACEHOLDER]

M62B441996–1999282 hp (210 kW)- (pattern data)£2,500–£6,500 [PLACEHOLDER]

Technical Specs

Engine TypeV8, 90-degree

ValvetrainDOHC, 32 valves (4 per cylinder)

Compression Ratio10.0:1 (M60) / 10.0:1 (M62)

Fuel SystemMulti-point fuel injection

IgnitionDistributorless Ignition System (DIS)

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Market Intelligence

Most Common Failure

Nikasil bore wear (M60) / Timing chain guides (M62)

generation-dependent 【PATTERN DATA】

Average Enquiry Mileage

85,000

miles 【PATTERN DATA】

Average Replacement Cost

£3,500 reconditioned, supply only 【PLACEHOLDER

confirm vs cost sheet】

Most Requested Engine Code

M62B44 (post-1996

higher-volume and more reliable) 【PATTERN DATA】

Peak Enquiry Season

Spring/Summer

classic car owners recommissioning after winter 【PATTERN DATA】

Regional Demand

South East22%

South West16%

London (14%) 【PATTERN DATA】

Regional Demand Breakdown

22%South East

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.

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every garage and engine rebuilder in our network is vetted, rated and reviewed by real 8 Series owners, with specialists who understand the M60 Nikasil bore wear issues, M62 timing chain guides, and cooling system vulnerabilities intimately - classic BMW specialists who know these V8s inside out.
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see prices, warranty terms and supply & fit options side-by-side before you commit, all from specialists experienced with this iconic grand tourer and its unique engine challenges.
UK Engine Replacement Services for 840Ci
supply-only or full supply & fit available nationwide, covering everything from timing chain guide replacement to full engine swaps on your E31 840Ci, with specialists who know how to source the correct Alusil-block replacements.

Find the best BMW 8 Series 840Ci engine replacement UK owners rely on. Compare prices from trusted specialists on EnginesMarket today and keep your classic V8 grand tourer on the road with confidence.

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12-Month Warranty

As standard

Nationwide Delivery

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BMW 8 Series 840Ci Engine Replacement — Compare Prices & Get Quotes

The 840Ci THROUGH TIME - Era Map

BMW 8 Series 840Ci Engine Replacement Costs

Common Problems With BMW 320d Engines

1. Nikasil Cylinder Liner Wear (M60B40 - 1992–1996)

1. Nikasil Cylinder Liner Wear (M60B40 - 1992–1996)

2. Timing Chain Guide Failure (M62B44 - 1996–1999)

3. Cooling System Failures (M60 & M62)

Weighing Your Options?

8 Series 840Ci - Repair, Buy, or Replace?

8 Series 840Ci - Repair, Buy, or Replace?

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BMW 320d Engine Codes

Market Intelligence

BMW 320d - Frequently Asked Questions

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