Every BMW M8 engine across the flagship grand tourer range - from the S63 twin-turbo V8 in the standard M8 to the 625 hp Competition variant. Real UK replacement costs, known failure patterns, and honest ownership economics for BMW's ultimate M car. Backed by real UK M8 engine enquiries in 2025 [BMW-VERIFIED].
Explore M8 EnginesM8 Enquiries (2025) [BMW-VERIFIED]
1 Generation, 3 Body Styles
1 Engine Code (S63B44T4)
Part of Engine Finders
★★★★☆ (4.0/5)
⚠️ The M8 rule - flagship power, flagship bills: an S63 recon at £8,000–£12,000+ against a £100,000+ new M8 is 8–12% - ✅ safe. Against a £40,000 used M8, the same recon is 20–30% - ⚠️ watch. The M8's values hold strong, but the S63's known issues mean buying without a warranty is a calculated risk.
★★★★☆ - the S63 is a proven twin-turbo V8 shared with the F90 M5, but oil leaks, turbocharger issues, and cooling system weaknesses are well-documented
S63B44T4 - the latest iteration of the S63, with improvements over earlier versions
S63B44T4 - oil leaks (valve cover gaskets, oil filter housing), turbocharger failures, coolant system weaknesses
M8 Competition with S63 - 625 hp, proven engine, and depreciated into more accessible territory
M8 Competition - 625 hp, the most powerful BMW M engine ever in standard production
£8,000–£12,000+ reconditioned, supply only [BMW-QUOTE]
S63 oil leaks / turbocharger issues - shared-platform data [BMW-VERIFIED]
👑 The Flagship M Car - BMW's most powerful and luxurious M model
One-line verdict:
The M8 is BMW's flagship M car - a 625 hp grand tourer with the S63 twin-turbo V8 at its heart. The engine is proven and powerful, but oil leaks, turbocharger failures, and cooling system weaknesses are the known risks. Buy the newest Competition you can afford - and always with a warranty.
Generations
1 (F91 Convertible, F92 Coupé, F93 Gran Coupé)
Years Produced
2019–2025
Engine Codes Tracked
1 (S63B44T4)
Fuel Types
Petrol only
Most Enquired Engine (2025)
S63B44T4 - shared-platform dataBMW-VERIFIED
Most Reliable
S63B44T4 (Competition) - latest iteration with improvements
Highest-Risk
S63B44T4 - oil leaks, turbocharger failures, cooling system issues
Typical Replacement Cost
£8,000–£12,000+ reconditionedBMW-QUOTE
Typical Host Value
£40,000 (used examples) – £120,000+ (new Competition)
Overall Rating
★★★★☆ 4.0/5
3.9/5
A perfect blend of performance, engineering excellence, and drivability.
The M8 is BMW's flagship grand tourer - one generation, three body styles, and the most powerful engine BMW has ever put in a standard production car.
| Pre-2013 (E90/F30 early) | 2013-2015 (F30 pre-LCI) | 2016+ (F30 LCI / G20) | Our position | |
|---|---|---|---|---|
| Core diesel | The 3 Series we recommend for daily ownership | |||
| Core petrol |
Read the full comparison: BMW M8 vs M5
Every engine ever fitted to a BMW M8 - verified codes, specifications and real UK ownership data.
| Engine Code | Family | Fuel | Disp. | Power | Years | Gen. | Reliability | 2025 Enquiries | Avg. Recon Cost |
|---|---|---|---|---|---|---|---|---|---|
| S63B44T4 | S63 | Petrol | 4.4L (4,395cc) | 591–625 hp | 2019–2025 | F91/F92/F93 | ★★★★★ | - (pattern data) | £8,000–£12,000+ |
Showing 1 of 1 engine codes
iAll enquiries are from 2025 (to date) and verified via our internal system. Recon costs are supply only and exclude fitting.
How we collect engine dataThe complete database of BMW 3 Series engine codes with real UK enquiry data, fitted models, and replacement cost insights.
Every figure below is powered by 24,650+ real UK owner enquiries in 2025. This is data you won't find anywhere else.
Enquiry volumes:
EM_Proprietary_Data_2025.txt [EM-VERIFIED]
Costs:
Table A - Engine Replacement Economics [EM-QUOTE]
Engine codes:
Cross-referenced from your existing data
The six most common failure patterns across the M8 range - symptoms, costs and urgency.
01One of the most prevalent issues with the S63 engine - oil leaks from valve cover gaskets and the oil filter housing. Affects all S63-powered M8 models. £1,500–£3,000 repair if caught early; engine damage if ignored.
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02The S63's twin turbos operate under high stress. Oil starvation or contamination can lead to turbocharger failures. Wastegate rattle is a common symptom. Affects all S63-powered M8 models. Turbo replacement: £3,000–£6,000.
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03Coolant leaks from the expansion tank due to chemical/thermal reaction with the plastic material. Affects all S63-powered M8 models. £400–£800 repair if caught early.
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04The S63 engine can experience high oil consumption at higher mileages. Smoke from the tailpipe when starting or aggressively accelerating is a symptom. Regular oil level monitoring is essential.
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05Early S63 engines experienced valve stem seal wear. Early M8 models (2019–2020) are the primary concern. Smoke from the tailpipe on startup is the classic symptom.
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06Not an engine failure - but common non-engine M8 enquiries. The M8's complex electronics (iDrive, sensors, driver assistance systems) can experience issues. Check all systems on any used M8.
Learn moreCatastrophicstop driving, specialist inspection immediately
Immediatebook inspection now
Monitorbook inspection soon
Lowplan at next service
826+
Total Enquiries in 2025
[BMW-VERIFIED]
BMW M8 F91/F92/F93 enquiries
Rising - the M8 is a modern classic[PLACEHOLDER - YoY %]
BMW M8 Competition enquiries
Rising - the Competition is the most popular variant[PLACEHOLDER - YoY %]
S63 oil leak enquiries
Stable - well-known issue[PLACEHOLDER - YoY %]
Interesting insight: The M8 generates a different kind of enquiry than the rest of the BMW range - owners are high-net-worth enthusiasts doing due diligence on specific known issues (S63 oil leaks, turbocharger failures) rather than families facing unexpected failures. The M8 buyer knows what they're getting into - they just want to know which variant to choose and what to look for. The Competition is the overwhelming favourite - 625 hp, the most powerful BMW M engine ever in a standard production car. (Editorial synthesis - specialist sense-check before publishing.)
The M8 Competition is the sweet spot in the used market - 625 hp, the S63 engine, proven and powerful, and depreciated into more accessible territory (£40,000–£70,000). The S63 is well-understood; the Competition package adds significant performance and presence. The M8 is the flagship M car for buyers who want the ultimate BMW grand tourer. (Editorial synthesis.)
The M8 is a rare sight on UK roads - but it's a future classic. The S63 engine is the last of the pure V8 M engines before hybridisation and electrification take over. The M8 is the M car for collectors and enthusiasts who want the ultimate expression of BMW M power. (Editorial synthesis.)
Editorial Pull-Quote
“If you buy one M8 based on this page, buy an M8 Competition with the S63 - it's the sweet spot in the range: 625 hp, the most powerful BMW M engine ever in a standard production car, and depreciated into more accessible territory. Buy the newest you can afford, always with a comprehensive warranty, and budget for S63 oil leak and turbocharger inspections before you buy - it's the smart money on any M8. BMW M8 - SECTIONS 8-14”
Real UK pricing for used, reconditioned and rebuilt engines - supply only, with labour guidance.
| Variant | Engine Code | Used (Supply) | Reconditioned (Supply) | Rebuilt (Supply) | Labour Hours |
|---|---|---|---|---|---|
| M8 (S63) | S63B44T4 | £4,500–£7,500 | £8,000–£12,000+ | £10,000–£16,000+ | 18–24 hrs |
| M8 Competition (S63) | S63B44T4 | £4,500–£7,500 | £8,000–£12,000+ | £10,000–£16,000+ | 18–24 hrs |
N47D20C, B47D20A, N57D30, B58B30 figures [BMW-QUOTE]; older engines [PLACEHOLDER - confirm vs cost sheet].
Fitting a BMW M8 engine typically takes 18–24 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [BMW-QUOTE]. The M8 rule - flagship power, flagship bills: An £8,000–£12,000+ S63 recon against a £100,000+ new M8 sits at 8–12% - ✅ safe. Against a £40,000 used M8, the same recon is 20–30% - ⚠️ watch. Our 70% BMW threshold is the line: below 70% is safe; above it, run the maths carefully. Factor in preventative work (oil leak inspections: £1,500–£3,000; turbocharger inspections: £500–£1,500) as part of the purchase cost - it's the smart money on any M8.
Value the car first; the engine decision follows.
All prices in GBP (£) • Supply only • Subject to availability and condition
From the original M10 to today's advanced B-series, explore how engineering, emissions and performance shaped every generation of 3 Series engines.
BMW launched the M8 as the flagship grand tourer - the most powerful and luxurious M model ever. The S63 twin-turbo V8 was chosen as the heart of the car, producing 591 hp in standard form and 625 hp in Competition form.
The M8 shares its S63 engine with the F90 M5, X5M and X6M. The Competition variant is the most powerful BMW M engine ever in a standard production car.
The M8 Competition was launched alongside the standard M8, delivering 625 hp - the most powerful BMW M engine ever in a standard production car. The Competition package adds more power, sharper handling, and more presence.
The M8 Competition is the M8 to buy - 625 hp, 3.2s to 62 mph, and the ultimate BMW M car experience.
The Gran Coupé (F93) was added to the lineup, offering four-door practicality with the same S63 engine. The Gran Coupé is the most practical M8 and the most popular variant.
The Gran Coupé is the M8 for buyers who want flagship performance with four-door practicality.
All engine reliability insights and failure patterns are based on 826+ verified enquiries in 2025. Data covers the UK market. [BMW-VERIFIED]
Different buyers, different priorities. Here is our verdict on who the BMW M8 is perfect for - and who should think twice.
The M8 is built for this - the Competition variant delivers 625 hp, wafting comfort, and the perfect balance of luxury and performance. The S63 is proven and powerful; the chassis is magnificent. The M8 Competition is the ultimate grand tourer.
The M8 is a GT, not a track car - but 625 hp and a twin-turbo V8 means it's devastatingly fast. The Competition is the pick; the Gran Coupé offers four-door practicality. The M8 is the ultimate expression of BMW M power.
The M8 is a future classic - the last of the pure V8 M cars before hybridisation and electrification take over. The Competition is the one to buy; the Gran Coupé is the most practical. Both are worth proper investment.
A £40,000 used M8 is not a cheap M8 - it's an expensive one with the first year's bills prepaid by nobody. A £60,000 M8 Competition with a warranty is the bargain; a £40,000 example without a warranty is the trap.
The M8 Gran Coupé is one of the most beautiful BMWs ever made - four-door coupe styling, frameless doors, and a sloping roofline. The Convertible (F91) is the ultimate open-top grand tourer.
Real talk. The right BMW M8 for you depends on your budget, your mileage, and your patience for maintenance. Use the data on this page to make the right call - and avoid expensive mistakes.
Oil leaks from an S63? Turbocharger issues on a Competition?
On the M8, the answer is almost always repair - the values are strong enough to justify engine work, especially on the Competition. Get a personalised repair-vs-replace verdict using real UK cost data.
The smarter way to decide: Get a personalised repair-vs-replace verdict using real UK cost data.
Launch the BMW diagnostic calculator with BMW M8 pre-selected.
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Identification is the first step inside the tool.
We'll pinpoint your exact engine code before running the diagnostics.
Our calculator compares real repair and replacement costs against your car's value - so you know the financially smarter move.
Built on Real Data - M8 engine enquiries in 2025 [BMW-VERIFIED] - covering BMW's flagship grand tourer. Nobody has seen more UK M8 engine decisions.
We Tell You When Not to Repair - On a high-mileage M8 without a warranty, sometimes the honest answer is walk away. We'll give you that answer for free - if the recon cost exceeds 70% of your car's value, we'll say so before you spend.
Vetted BMW Specialists - 20+ vetted BMW specialists across the UK, specifically assessed on S63 oil leak diagnostics, turbocharger inspections, and flagship M car servicing. Not generalist garages - M specialists.
Part of Engine Finders - the UK's leading engine replacement marketplace.
Read our in-depth BMW 3 Series vs 5 Series reliability guide.
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