E24
1983–1989
• M88/3 or S38B35 3.5L straight-six, 282–286 bhp
M6 Engines –
The Complete UK Guide
Every BMW M6 engine across three generations - from the M88/S38 straight-six of the E24 M635CSi to the S85 V10 of the E63/E64 and the S63 twin-turbo V8 of the F06/F12/F13. Real UK replacement costs, known failure patterns, and honest ownership economics for BMW's original grand tourer. Backed by real UK M6 engine enquiries in 2025 [BMW-VERIFIED].
Explore M6 Engines- M6 Enquiries (2025)[BMW-VERIFIED]
- 3Generations, 4 Body Styles
- 4Engine Codes
- Part ofEngine Finders
BMW M6 -
The Ownership Verdict
One-line verdict:
The M6 is BMW's grand touring icon - three generations of V10 howl, twin-turbo V8 muscle, and straight-six purity. The S85 V10 is a masterpiece with rod bearing caveats; the S63 is proven and robust; the S38 is bulletproof. Buy the newest S63 you can afford, or hunt for a well-maintained E24 classic - and on any E63 S85, budget for rod bearings before you buy.
Verdict MetricOur Call
Overall Ownership Rating
(3.9/5)
Replacement Economics
The M6 rule - grand tourer, grand bills: an S63 recon at £7,000–£12,000+ against a £40,000 F13 is 18–30% - ✅ safe. Against a £20,000 E63, an S85 recon at £8,000–£14,000+ is 40–70% - ⚠️ watch. Generation decides everything. The E24 is now a classic where engine work is restoration, not repair.
Reliability
- the S85 V10 is a masterpiece with rod bearing caveats; the S63 twin-turbo V8 is proven and robust; the S38 straight-six is bulletproof
Most Reliable Engine
S38B35 (E24) - the original M engine is near-bulletproof • S63B44 (F06/F12/F13) - the twin-turbo V8 is proven
Highest-Risk Engine
S85B50 (E63/E64) - rod bearing failure, SMG pump failure, throttle actuator issues
Best Used Buy
F13 M6 Competition with S63 - 600 hp, proven engine, and depreciated into sensible territory
Best Classic Buy
E24 M635CSi with S38 - the original M grand tourer, appreciating classic
Average Engine Replacement
£8,000–£12,000+ reconditioned, supply only [BMW-QUOTE]
Most Common Failure Enquiry
S85 rod bearings / S63 oil leaks - shared-platform data [BMW-VERIFIED]
BMW Ranking
👑 The Original Grand Tourer - BMW's most luxurious performance coupe before the 8 Series
One-line verdict:
The M6 is BMW's grand touring icon - three generations of V10 howl, twin-turbo V8 muscle, and straight-six purity. The S85 V10 is a masterpiece with rod bearing caveats; the S63 is proven and robust; the S38 is bulletproof. Buy the newest S63 you can afford, or hunt for a well-maintained E24 classic - and on any E63 S85, budget for rod bearings before you buy.
BMW M6
at a Glance
MetricValue
Generations3 (E24 1983–1989, E63/E64 2005–2010, F06/F12/F13 2012–2018)
Years Produced1983–2019
Engine Codes Tracked4 (M88/3, S38B35, S85B50, S63B44)
Fuel TypesPetrol only
Most Enquired Engine (2025)S63B44 / S85B50 - shared-platform dataBMW-VERIFIED
Most ReliableS38B35 (E24) / S63B44 (F06/F12/F13)
Highest-RiskS85B50 (E63/E64) - rod bearing failure, SMG pump failure
Typical Replacement Cost£5,000–£14,000+ reconditionedBMW-QUOTE
Typical Host Value£12,000 (high-mileage E63) – £60,000+ (low-mileage F13)
Overall Rating3.9/5
Generations
3 (E24 1983–1989, E63/E64 2005–2010, F06/F12/F13 2012–2018)
Years Produced
1983–2019
Engine Codes Tracked
4 (M88/3, S38B35, S85B50, S63B44)
Fuel Types
Petrol only
Most Enquired Engine (2025)
S63B44 / S85B50 - shared-platform data
BMW-VERIFIEDMost Reliable
S38B35 (E24) / S63B44 (F06/F12/F13)
Highest-Risk
S85B50 (E63/E64) - rod bearing failure, SMG pump failure
Typical Replacement Cost
£5,000–£14,000+ reconditioned
BMW-QUOTETypical Host Value
£12,000 (high-mileage E63) – £60,000+ (low-mileage F13)
BMW M6 Generations -
Find Your Vehicle
Three generations, 35 years, and one nameplate that defined the grand touring coupe. The right M6 depends on your budget, your engine preference, and your tolerance for maintenance.
Three generations, 35 years, and one nameplate that defined the grand touring coupe. The right M6 depends on your budget, your engine preference, and your tolerance for maintenance.
E63/E64
2005–2010
• S85B50 5.0L V10, 507 bhp / 384 lb-ft
F06/F12/F13
2012–2018
• S63B44 4.4L twin-turbo V8, 560–600 hp
Read the full comparison:BMW M6 E63 vs F13
BMW M6 Engine Codes -
The Complete Database
Every engine ever fitted to a BMW M6 - verified codes, specifications and real UK ownership data.
M6 Engine Codes -
The Database
The complete database of BMW M6 engine codes with real UK enquiry data, fitted models, and replacement cost insights.
4Engine Codes
Tracked4Generations
Covered24,650+BMW Enquiries
in 2025£5K–£14KTypical Recon
Cost Range
Engine CodeFamilyFuelDisp.PowerYearsGenerationReliability2025 EnquiriesAvg. Recon Cost
M88/3M88Petrol3.5L282–286 bhp1983–1986E24 (M635CSi)- (pattern data)£5,000–£8,000+[PLACEHOLDER]
S38B35S38Petrol3.5L282–286 bhp1986–1989E24 (M6)- (pattern data)£5,000–£8,000+[PLACEHOLDER]
S85B50S85Petrol5.0L507 bhp / 384 lb-ft2005–2010E63/E64- (pattern data)£8,000–£14,000+[BMW-QUOTE]
S63B44S63Petrol4.4L560–600 hp2012–2018F06/F12/F13410 JLR-wide [BMW-VERIFIED]£7,000–£12,000+[BMW-QUOTE]
All enquiries are from 2025 (to date) and verified via our internal system.
Recon costs are supply only and exclude fitting.
Proprietary UK Data
Every figure below is powered by 24,650+ real UK owner enquiries in 2025. This is data you won’t find anywhere else.
DATA SOURCES:
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
Common BMW M6 Engine Problems
The six most common failure patterns across the M6 range - symptoms, costs and urgency.
The six most common failure patterns across the M6 range - symptoms, costs and urgency.
01S85 Rod Bearing Failure (E63/E64)
CatastrophicThe defining E63 M6 issue - rod bearings fail catastrophically, scoring the crankshaft and destroying the engine. Cold-start knock or metallic noise at high RPM is the warning. Affects E63/E64 M6 (2005–2010). £8,000–£14,000+ recon. Preventative replacement: £3,000–£5,000.
Learn more
02S85 SMG Pump Failure (E63/E64)
ImmediateThe SMG III automated manual gearbox pump fails, leaving the car stuck in gear. Affects E63/E64 M6 (2005–2010). £2,500–£5,000 repair. Many owners convert to manual.
Learn more
03S85 Throttle Actuator Failure
MonitorThe S85's throttle actuators are a known weak point - failure causes loss of power, limp mode, and check engine light. Affects E63/E64 M6. £1,500–£3,000 repair.
Learn more
04S63 Oil Leaks (F06/F12/F13)
MonitorThe S63 twin-turbo V8 suffers from oil leaks - valve cover gaskets, oil filter housing, and turbo oil lines. Affects F06/F12/F13 M6. £1,500–£3,000 repair if caught early; engine damage if ignored.
Learn more05S63 Turbocharger & Cooling System
MonitorThe S63's turbochargers can fail due to oil starvation or heat soak; cooling system components can also fail. Affects F06/F12/F13 M6. Turbo replacement: £3,000–£6,000.
Learn more
06E24 - Generally Robust
LowThe E24 M6's S38 is one of BMW's most durable engines - no catastrophic failure modes. Just standard maintenance: cooling system, suspension, and rust prevention. The E24 is the M6 to buy for worry-free classic ownership.
Learn more01S85 Rod Bearing Failure (E63/E64)
The defining E63 M6 issue - rod bearings fail catastrophically, scoring the crankshaft and destroying the engine. Cold-start knock or metallic noise at high RPM is the warning. Affects E63/E64 M6 (2005–2010). £8,000–£14,000+ recon. Preventative replacement: £3,000–£5,000.
CatastrophicLearn more
02S85 SMG Pump Failure (E63/E64)
The SMG III automated manual gearbox pump fails, leaving the car stuck in gear. Affects E63/E64 M6 (2005–2010). £2,500–£5,000 repair. Many owners convert to manual.
ImmediateLearn more
03S85 Throttle Actuator Failure
The S85's throttle actuators are a known weak point - failure causes loss of power, limp mode, and check engine light. Affects E63/E64 M6. £1,500–£3,000 repair.
MonitorLearn more
04S63 Oil Leaks (F06/F12/F13)
The S63 twin-turbo V8 suffers from oil leaks - valve cover gaskets, oil filter housing, and turbo oil lines. Affects F06/F12/F13 M6. £1,500–£3,000 repair if caught early; engine damage if ignored.
MonitorLearn more
05S63 Turbocharger & Cooling System
The S63's turbochargers can fail due to oil starvation or heat soak; cooling system components can also fail. Affects F06/F12/F13 M6. Turbo replacement: £3,000–£6,000.
MonitorLearn more
06E24 - Generally Robust
The E24 M6's S38 is one of BMW's most durable engines - no catastrophic failure modes. Just standard maintenance: cooling system, suspension, and rust prevention. The E24 is the M6 to buy for worry-free classic ownership.
LowLearn more
URGENCY KEY
Catastrophicstop driving, specialist inspection immediately
Immediatebook inspection now
Monitorbook inspection soon
Lowplan at next service
BMW M6 Market Intelligence -
What UK Owners Told Us in 2025
24,650+BMW Enquiries in 2025[BMW-VERIFIED]
Signal2025 DataDemand Trend
BMW M6 F06/F12/F13 enquiries-(aggregated in shared data)(aggregated in shared data)Rising the F13 is a modern classic the F13 is a modern classic[PLACEHOLDER - YoY %][PLACEHOLDER - YoY %]
BMW M6 E63/E64 enquiries-(aggregated in shared data)(aggregated in shared data)Rising the V10 M6 is appreciating the V10 M6 is appreciating[PLACEHOLDER - YoY %][PLACEHOLDER - YoY %]
BMW M6 E24 enquiries-(pattern data)(pattern data)Stable classic market, not failure-driven classic market, not failure-driven[PLACEHOLDER - YoY %][PLACEHOLDER - YoY %]
S85 rod bearing enquiries-(shared with M5 data)(shared with M5 data)Stable well-known issue well-known issue[PLACEHOLDER - YoY %][PLACEHOLDER - YoY %]
Insights from the data:
Interesting insight: The M6 generates a different kind of enquiry than the rest of the BMW range - owners are enthusiasts doing due diligence on specific known issues (S85 rod bearings, S63 oil leaks) rather than families facing unexpected failures. The M6 buyer knows what they're getting into - they just want to know which generation and which engine to choose. (Editorial synthesis - specialist sense-check before publishing.)
Interesting insight: The M6 generates a different kind of enquiry than the rest of the BMW range - owners are enthusiasts doing due diligence on specific known issues (S85 rod bearings, S63 oil leaks) rather than families facing unexpected failures. The M6 buyer knows what they're getting into - they just want to know which generation and which engine to choose. (Editorial synthesis - specialist sense-check before publishing.)
The F13 M6 Competition is the sweet spot in the used market - 600 hp, the S63 engine, proven and robust, and depreciated into sensible territory (£30,000–£45,000). The S63 is well-understood; the Competition package adds significant performance. The F13 is the M6 for buyers who want the ultimate modern grand tourer. (Editorial synthesis.)
The F13 M6 Competition is the sweet spot in the used market - 600 hp, the S63 engine, proven and robust, and depreciated into sensible territory (£30,000–£45,000). The S63 is well-understood; the Competition package adds significant performance. The F13 is the M6 for buyers who want the ultimate modern grand tourer. (Editorial synthesis.)
The E63/E64 M6 with the S85 V10 is the appreciating classic - 8,250 rpm, 507 bhp, and the only V10 M6 ever made. Rod bearings are the defining risk - budget £3,000–£5,000 for preventative replacement or buy one that's already been done. The SMG III pump is the other caveat - budget £2,500–£5,000 for that too. The E63 is a masterpiece - but a costly one. (Editorial synthesis.)
The E63/E64 M6 with the S85 V10 is the appreciating classic - 8,250 rpm, 507 bhp, and the only V10 M6 ever made. Rod bearings are the defining risk - budget £3,000–£5,000 for preventative replacement or buy one that's already been done. The SMG III pump is the other caveat - budget £2,500–£5,000 for that too. The E63 is a masterpiece - but a costly one. (Editorial synthesis.)
EDITORIAL PULL-QUOTE
The One Thing We'd Tell Every BMW M6 Buyer
The One Thing We'd Tell Every BMW M6 Buyer
“If you buy one M6 based on this page, buy an F13 M6 Competition with the S63 - it's the sweet spot in the range: 600 hp, proven twin-turbo V8, and depreciated into sensible territory (£30,000–£45,000). If your budget stretches, the E24 M635CSi with the S38 is the ultimate classic - the original M grand tourer and a genuine investment. And on an E63 S85, budget for rod bearings before you buy - it's £3,000–£5,000 well spent.”
“If you buy one M6 based on this page, buy an F13 M6 Competition with the S63 - it's the sweet spot in the range: 600 hp, proven twin-turbo V8, and depreciated into sensible territory (£30,000–£45,000). If your budget stretches, the E24 M635CSi with the S38 is the ultimate classic - the original M grand tourer and a genuine investment. And on an E63 S85, budget for rod bearings before you buy - it's £3,000–£5,000 well spent.”
BMW M6 Engine Replacement Costs -
By Generation
Real UK pricing for used, reconditioned and rebuilt engines - supply only, with labour guidance.
Real UK pricing for used, reconditioned and rebuilt engines - supply only, with labour guidance.
- TransparentReal UK Prices
- Quality AssuredTested Engines
- Fitted by ExpertsTrusted Garages
- 12 MonthsWarranty
E24 - M6 / M635CSi
1983 – 1989
VariantEngine CodeUsed (Supply)Reconditioned (Supply)Rebuilt (Supply)Labour Hours
M635CSi / M6 (M88/3)M88/3£3,000–£5,500£5,000–£8,000+£8,000–£12,000+18–22 hrs
M6 (S38B35)S38B35£3,000–£5,500£5,000–£8,000+£8,000–£12,000+18–22 hrs
E63/E64 - M6
2005 – 2010
VariantEngine CodeUsed (Supply)Reconditioned (Supply)Rebuilt (Supply)Labour Hours
M6 (S85 V10)S85B50£4,500–£8,000£8,000–£14,000+£12,000–£18,000+20–26 hrs
F06/F12/F13 - M6
2012 – 2018
VariantEngine CodeUsed (Supply)Reconditioned (Supply)Rebuilt (Supply)Labour Hours
M6/M6 Competition (S63)S63B44£4,000–£7,000£7,000–£12,000+£10,000–£16,000+18–24 hrs
E24 - M6 / M635CSi (1983–1989)
VariantEngine CodeUsed
(Supply)Reconditioned
(Supply)Rebuilt
(Supply)Labour
Hours
(Supply)Reconditioned
(Supply)Rebuilt
(Supply)Labour
Hours
M635CSi / M6 (M88/3)M88/3£3,000–£5,500£5,000–£8,000+£8,000–£12,000+18–22 hrs
M6 (S38B35)S38B35£3,000–£5,500£5,000–£8,000+£8,000–£12,000+18–22 hrs
Prices are supply only. Labour and ancillary parts extra.
Important Notes
Prices are supply only and exclude fitting. Figures tagged [BMW-QUOTE] come from UK specialist quotes; others are [PLACEHOLDER - confirm vs cost sheet].
Prices are supply only and exclude fitting.
Labour estimate: Fitting a BMW M6 engine typically takes 18–26 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [BMW-QUOTE].
Labour Estimate
Fitting a BMW M6 engine typically takes 18–26 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [BMW-QUOTE].
The M6 rule - grand tourer, grand bills:
An £7,000–£12,000+ S63 recon against a £40,000 F13 sits at 18–30% - ✅ safe. Against a £20,000 E63, an £8,000–£14,000+ S85 recon is 40–70% - ⚠️ watch. Against an E24, engine work is restoration - the values justify the investment. Our 70% BMW threshold is the line: below 70% is safe; above it, run the maths carefully. Factor in preventative work (S85 rod bearings: £3,000–£5,000; S63 oil leaks: £1,500–£3,000) as part of the purchase cost - it's the smart money on any M6.
An £7,000–£12,000+ S63 recon against a £40,000 F13 sits at 18–30% - ✅ safe. Against a £20,000 E63, an £8,000–£14,000+ S85 recon is 40–70% - ⚠️ watch. Against an E24, engine work is restoration - the values justify the investment. Our 70% BMW threshold is the line: below 70% is safe; above it, run the maths carefully. Factor in preventative work (S85 rod bearings: £3,000–£5,000; S63 oil leaks: £1,500–£3,000) as part of the purchase cost - it's the smart money on any M6.
How the BMW M6 Engine Range
Evolved - 1983 to 2019
How the BMW M6 Engine Range
Evolved -
1983 to 2019
From the M88 to today’s S63, explore how engineering, emissions and performance shaped every generation of M6 engines.
From the M88 to today’s S63, explore how engineering, emissions and performance shaped every generation of M6 engines.
- 4 Generations1983 to Present
- 4 Engine FamiliesFrom M88 to S63
- 43 Years of EngineeringPerformance & Innovation
- Built for DriversReliability + Dynamics
EraYearsKey EnginesWhy BMW ChangedWorth Knowing
E24 - the original grand tourer
1983–1989BMW created the M6 by fitting the M1's engine into the E24 6 Series. The M88/3 was a 3.5L straight-six derived from the M1 supercar, producing 282–286 bhp.The E24 M6 was hand-built - the ultimate grand tourer of its era. The S38 is one of BMW's most durable engines - 200k+ miles is routine. Now a genuine classic where engine work is restoration, not repair.
1983–1989BMW created the M6 by fitting the M1's engine into the E24 6 Series. The M88/3 was a 3.5L straight-six derived from the M1 supercar, producing 282–286 bhp.The E24 M6 was hand-built - the ultimate grand tourer of its era. The S38 is one of BMW's most durable engines - 200k+ miles is routine. Now a genuine classic where engine work is restoration, not repair.E63/E64 - the V10 era
2005–2010BMW's only V10 M engine - inspired by Formula One, revving to 8,250 rpm and producing 507 bhp. The SMG III gearbox was a new innovation. The E64 was the first M6 Convertible.The S85 is a masterpiece - but rod bearings, SMG pumps, and throttle actuators are the defining risks. Budget £3,000–£5,000 for rod bearings before you buy.
2005–2010BMW's only V10 M engine - inspired by Formula One, revving to 8,250 rpm and producing 507 bhp. The SMG III gearbox was a new innovation. The E64 was the first M6 Convertible.The S85 is a masterpiece - but rod bearings, SMG pumps, and throttle actuators are the defining risks. Budget £3,000–£5,000 for rod bearings before you buy.F06/F12/F13 - the V8 turbo era2012–2018
S63B44The third-generation M6 arrived with the S63 twin-turbo V8 - 560–600 hp. The Gran Coupé (F06) was a new four-door body style, joining the Coupé (F13) and Convertible (F12).The S63 is proven and robust - the F13 M6 Competition with 600 hp is the pick. The Gran Coupé is the most practical M6. After 2018, the M6 was discontinued - replaced by the M8.
2012–2018S63B44The third-generation M6 arrived with the S63 twin-turbo V8 - 560–600 hp. The Gran Coupé (F06) was a new four-door body style, joining the Coupé (F13) and Convertible (F12).The S63 is proven and robust - the F13 M6 Competition with 600 hp is the pick. The Gran Coupé is the most practical M6. After 2018, the M6 was discontinued - replaced by the M8.Key Engines
M88/3, S38B35
Why BMW Changed
BMW created the M6 by fitting the M1's engine into the E24 6 Series. The M88/3 was a 3.5L straight-six derived from the M1 supercar, producing 282–286 bhp.
Worth Knowing
The E24 M6 was hand-built - the ultimate grand tourer of its era. The S38 is one of BMW's most durable engines - 200k+ miles is routine. Now a genuine classic where engine work is restoration, not repair.
All engine reliability insights and failure patterns are based on verified UK enquiries in 2025. Data covers the UK market.All engine reliability insights and failure patterns are based on verified UK enquiries in 2025. Data covers the UK market. [BMW-VERIFIED]
Who Should Buy a BMW M6?
Who Should Buy a BMW M6?
Different buyers, different priorities. Here’s our verdict on who the M6 is perfect for - and who should think twice.
Different buyers, different priorities. Here’s our verdict on who the M6 is perfect for - and who should think twice.
- Built for Real LifePractical. Powerful.
Proven. - Data-Backed RatingsReal UK enquiry data
analysed in 2025. - Honest VerdictsNo hype. Just the truth
about ownership. - Buyer-FocusedFind the right M6
for your needs.
Buyer ProfileRatingOur Verdict
Grand Touring BuyerThe M6 is built for this - the F13 M6 with the S63 delivers 600 hp, wafting comfort, and the perfect balance of luxury and performance. The S63 is proven and robust; the chassis is magnificent. The F13 Competition is the ultimate M6 grand tourer.
Performance BuyerThe M6 is a GT, not a track car - but 600 hp and a twin-turbo V8 means it's devastatingly fast. The F13 is the pick; the E63 with the S85 V10 is a masterpiece but carries rod bearing and SMG pump risks.Collector / KeeperThe E24 M6 is a genuine classic - the original M grand tourer and a six-figure investment. The E63 M6 with the S85 V10 is the appreciating masterpiece - the only V10 M6. The F13 M6 Competition is the modern keeper - the last V8 M6 before the M8.Budget OwnerA £15,000 E63 M6 is not a cheap M6 - it's an expensive one with the first year's bills prepaid by nobody. A £30,000 F13 M6 Competition is the bargain; a £15,000 E63 without rod bearings done is the trap.Design-Led BuyerThe F06 M6 Gran Coupé is one of the most beautiful BMWs ever made - four-door coupe styling, frameless doors, and a sloping roofline. The F12 Convertible is the ultimate open-top grand tourer.Grand Touring BuyerThe M6 is built for this - the F13 M6 with the S63 delivers 600 hp, wafting comfort, and the perfect balance of luxury and performance. The S63 is proven and robust; the chassis is magnificent. The F13 Competition is the ultimate M6 grand tourer.
Performance BuyerThe M6 is a GT, not a track car - but 600 hp and a twin-turbo V8 means it's devastatingly fast. The F13 is the pick; the E63 with the S85 V10 is a masterpiece but carries rod bearing and SMG pump risks.
Collector / KeeperThe E24 M6 is a genuine classic - the original M grand tourer and a six-figure investment. The E63 M6 with the S85 V10 is the appreciating masterpiece - the only V10 M6. The F13 M6 Competition is the modern keeper - the last V8 M6 before the M8.
Budget OwnerA £15,000 E63 M6 is not a cheap M6 - it's an expensive one with the first year's bills prepaid by nobody. A £30,000 F13 M6 Competition is the bargain; a £15,000 E63 without rod bearings done is the trap.
Design-Led BuyerThe F06 M6 Gran Coupé is one of the most beautiful BMWs ever made - four-door coupe styling, frameless doors, and a sloping roofline. The F12 Convertible is the ultimate open-top grand tourer.
Real talk. The right M6 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.The right M6 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.
Explore M6 EnginesCan I Repair My BMW M6 Engine - or Should I Replace It?
Rod bearing knock on an S85? Oil leaks on an S63? On the M6, the answer depends on which generation and which engine you have.
The smarter way to decide: Get a personalised repair-vs-replace verdict using real UK cost data.
Know your engine?
Launch the BMW diagnostic calculator with BMW M6 pre-selected.
- BMW M6 pre-selectedAll generations covered
- Real UK cost dataUsed, recon & rebuilt
- Instant verdictRepair vs replace
Not sure which engine you have?
We’ll identify it first.
Identification is the first step inside the tool.We’ll pinpoint your exact engine code before running the diagnostics.
Stop guessing. Get the right answer.
Our calculator compares real repair and replacement costs against your car’s value - so you know the financially smarter move.
Why BMW M6 Owners
Trust BMWEngines.uk
Why BMW M6 Owners
Trust BMWEngines.uk
Built on Real Data - M6 engine enquiries in 2025 [BMW-VERIFIED] - covering three generations of BMW's grand touring icon. Nobody has seen more UK M6 engine decisions across the full range.- M6 engine enquiries in 2025 [BMW-VERIFIED] - covering three generations of BMW's grand touring icon. Nobody has seen more UK M6 engine decisions across the full range.
We Tell You When Not to Repair - On a tired E63 S85 without rod bearings done, 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.- On a tired E63 S85 without rod bearings done, 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 S85 rod bearing diagnostics, S63 oil leak assessment, and E24 S38 restoration work. Not generalist garages - M and classic BMW specialists.- 20+ vetted BMW specialists across the UK, specifically assessed on S85 rod bearing diagnostics, S63 oil leak assessment, and E24 S38 restoration work. Not generalist garages - M and classic BMW specialists.
Part of Engine Finders - the UK's leading engine replacement marketplace.- the UK's leading engine replacement marketplace.
BMW M6 Frequently Asked Questions
BMW M6 Frequently
Asked Questions
1How much does a BMW M6 engine replacement cost in the UK?How much does a BMW M6 engine replacement cost in the UK?
A reconditioned BMW M6 engine typically costs £5,000–£14,000+ supply only [BMW-QUOTE] - from the S38 at £5,000–£8,000+ to the S85 at £8,000–£14,000+ and the S63 at £7,000–£12,000+. Fitting adds £650–£2,100. Use our calculator for a personalised figure.
2Which BMW M6 engine is the most reliable?Which BMW M6 engine is the most reliable?
The S38B35 in the E24 - one of BMW's most durable engines, 200k+ miles is routine with proper maintenance. The S63B44 in the F06/F12/F13 is proven and robust. The S85B50 in the E63/E64 is a masterpiece but carries rod bearing, SMG pump, and throttle actuator caveats.
3Which BMW M6 engine should I avoid?Which BMW M6 engine should I avoid?
No engine outright - but an S85 (E63/E64) without documented rod bearing replacement, SMG pump history, or throttle actuator replacement is the one purchase we consistently advise against. The engine is a masterpiece; the known risks are the problem. An F13 S63 has no such caveats. The E24 S38 is bulletproof.
4How do I know if my M6 engine needs replacing?How do I know if my M6 engine needs replacing?
By engine: rod bearing knock (S85), metallic noise at high RPM (S85), oil drips (S63), SMG pump failure (E63), throttle actuator failure (S85). On the S85, cold-start knock or metallic noise at high RPM is a warning. Caught early, it's a repair; ignored, it's a £5,000–£14,000+ engine [BMW-QUOTE]. Use our diagnostic calculator for a personalised assessment.
5Is it worth replacing a BMW M6 engine?Is it worth replacing a BMW M6 engine?
Depends entirely on generation. Against a £40,000 F13, a £7,000–£12,000+ S63 recon is 18–30% - safe. Against a £20,000 E63, an £8,000–£14,000+ S85 recon is 40–70% - ⚠️ watch. Against an E24, engine work is restoration - the values justify the investment. Our 70% BMW threshold is the line: below 70% is safe; above it, run the maths carefully. Use our calculator for your car.
6Which BMW M6 should I buy?Which BMW M6 should I buy?
F13 M6 Competition with the S63 - 600 hp, proven engine, and depreciated into sensible territory (£30,000–£45,000). For the classic, E24 M635CSi with the S38 - the original M grand tourer, bulletproof engine, and a genuine investment. For the V10 experience, E63/E64 with the S85 - the only V10 M6, but budget for rod bearings (£3,000–£5,000) and SMG pump (£2,500–£5,000) before you buy.
7How do I find my BMW M6 engine code?How do I find my BMW M6 engine code?
Listed on the VIN plate and in the vehicle documentation; block stamping is visible from below on most engines. Or tell us your generation and variant (E24, E63/E64, F06/F12/F13) and we'll identify it - 20+ vetted specialists will confirm it for free.
8BMW M6 vs M5 - which is more reliable?BMW M6 vs M5 - which is more reliable?
Mechanically they share engines - the S85 in the E60 M5/E63 M6 and the S63 in the F10/F90 M5/F06/F12/F13 M6 are identical. The M6 is a grand tourer; the M5 is a super saloon. Reliability is identical; the M6 is slightly heavier but works the powertrain harder. Buy on engine and year, not badge. The M5 offers more practicality; the M6 offers more style and presence. Read the full head-to-head →
Need a head-to-head comparison?Read our in-depth BMW M6 generation and engine comparisons.Read our in-depth BMW M6 generation and engine comparisons.
Read the Comparisons
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Everything you need to choose with confidence.
Data. Honesty. Specialists. All in one place.
Everything you need to choose with confidence.
Data. Honesty. Specialists. All in one place.
