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 EnginesM6 Enquiries (2025) [BMW-VERIFIED]
3 Generations, 4 Body Styles
4 Engine Codes
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★★★★☆ (3.9/5)
⚠️ 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.
★★★★☆ - 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
S38B35 (E24) - the original M engine is near-bulletproof • S63B44 (F06/F12/F13) - the twin-turbo V8 is proven
S85B50 (E63/E64) - rod bearing failure, SMG pump failure, throttle actuator issues
F13 M6 Competition with S63 - 600 hp, proven engine, and depreciated into sensible territory
E24 M635CSi with S38 - the original M grand tourer, appreciating classic
£8,000–£12,000+ reconditioned, supply only [BMW-QUOTE]
S85 rod bearings / S63 oil leaks - shared-platform data [BMW-VERIFIED]
👑 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.
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 dataBMW-VERIFIED
Most 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+ reconditionedBMW-QUOTE
Typical Host Value
£12,000 (high-mileage E63) – £60,000+ (low-mileage F13)
Overall Rating
★★★★☆
3.9/5
A perfect blend of performance, engineering excellence, and drivability.
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.
| 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 M6 E63 vs F13
Every engine ever fitted to a BMW M6 - verified codes, specifications and real UK ownership data.
| Engine Code | Family | Fuel | Disp. | Power | Years | Gen. | Reliability | 2025 Enquiries | Avg. Recon Cost |
|---|---|---|---|---|---|---|---|---|---|
| M88/3 | M88 | Petrol | 3.5L | 282–286 bhp | 1983–1986 | E24 (M635CSi) | ★★★★★ | - (pattern data) | £5,000–£8,000+ |
| S38B35 | S38 | Petrol | 3.5L | 282–286 bhp | 1986–1989 | E24 (M6) | ★★★★★ | - (pattern data) | £5,000–£8,000+ |
| S85B50 | S85 | Petrol | 5.0L | 507 bhp / 384 lb-ft | 2005–2010 | E63/E64 | ★★★★★ | - (pattern data) | £8,000–£14,000+ |
| S63B44 | S63 | Petrol | 4.4L | 560–600 hp | 2012–2018 | F06/F12/F13 | ★★★★★ | 410 JLR-wide [BMW-VERIFIED] | £7,000–£12,000+ |
Showing 4 of 4 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 M6 range - symptoms, costs and urgency.
01The 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.
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02The 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.
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03The 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.
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04The 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.
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05The 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.
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06The 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 moreCatastrophicstop driving, specialist inspection immediately
Immediatebook inspection now
Monitorbook inspection soon
Lowplan at next service
826+
Total Enquiries in 2025
[BMW-VERIFIED]
BMW M6 F06/F12/F13 enquiries
Rising - the F13 is a modern classic[PLACEHOLDER - YoY %]
BMW M6 E63/E64 enquiries
Rising - the V10 M6 is appreciating[PLACEHOLDER - YoY %]
BMW M6 E24 enquiries
Stable - classic market, not failure-driven[PLACEHOLDER - YoY %]
S85 rod bearing enquiries
Stable - well-known issue[PLACEHOLDER - YoY %]
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 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
“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.”
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 |
|---|---|---|---|---|---|
| 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 |
N47D20C, B47D20A, N57D30, B58B30 figures [BMW-QUOTE]; older engines [PLACEHOLDER - confirm vs cost sheet].
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.
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 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.
BMW'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.
The 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.
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 M6 is perfect for - and who should think twice.
The 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.
The 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.
The 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.
A £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.
The 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 BMW 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.
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. 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 M6 pre-selected.
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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 - 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.
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.
Part of Engine Finders - the UK's leading engine replacement marketplace.
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