Every BMW 6 Series engine across three generations and four body styles -from the N52 straight-six to the N63 V8, the S85 V10, and the B57 straight-six. Real UK replacement costs, known failure patterns, and honest ownership economics for the grand tourer that defined a segment. Backed by 200+ real UK 6 Series engine enquiries in 2025 [BMW-VERIFIED].
Explore 6 Series Engines200+ Enquiries (2025) [BMW-VERIFIED]
3 Generations, 4 Body Styles
12+ Engine Codes
Part of Engine Finders
★★★½ (3.5/5)
⚠️ The 6 Series rule - the grand tourer premium: a £6,000–£10,000 N63 recon against a £15,000 F06 650i is 40–67% of the car's value - ⚠️ watch. The same engine against a £50,000 F13 M6 is just 12–20% - ✅ safe. Generation and body style decide everything.
★★★☆☆ - the engines range from the robust N52 and B57 to the notorious N63 V8; the S85 V10 is a masterpiece that demands deep pockets.
B57D30 (640d) and N52B30 (630i) - the straight-six diesels and naturally-aspirated petrols are the dependable choices
N63B44 (650i) - hot-vee V8 with valve stem seal, timing chain and oil consumption issues • Early N62B48 with valve stem seal failure
F06/F12/F13 640d with B57 - the diesel straight-six is robust, economical, and the 6 Series experience without the V8 bills
F06/F12/F13 640i with N55 - the turbo straight-six is the sweet spot; the 650i's N63 is the one to avoid without a warranty
£5,500 reconditioned, supply only [BMW-QUOTE]
N63 oil consumption / valve stem seals - shared-platform data [BMW-VERIFIED]
🏆 The Grand Tourer - style, presence, and the most expensive engine bills in the non-M BMW range
One-line verdict:
The 6 Series is BMW's grand tourer - beautiful, powerful, and expensive to keep. The N63 V8 is the defining risk: a £6,000–£10,000 recon is a routine repair on a £50,000 car and a death sentence on a £12,000 one. Buy the straight-six diesel or petrol unless you have the budget for V8 bills.
Generations
3 (E63/E64, F06/F12/F13, G32)
Years Produced
2003–present
Engine Codes Tracked
12+
Fuel Types
Petrol, Diesel, Mild-Hybrid (2020+)
Most Enquired Engine (2025)
N63B44 -shared-platform dataBMW-VERIFIED
Most Reliable
B57D30 / N52B30 / N55B30
Highest-Risk
N63B44 (valve stem seals, timing chain) / N62B48 (valve stem seals)
Typical Replacement Cost
£3,000–£10,000 reconditionedBMW-QUOTE
Typical Host Value
£6,000 (early E63) – £60,000+ (late F13 M6)
Overall Rating
★★★½ 3.5/5
3.9/5
A perfect blend of performance, engineering excellence, and drivability.
Three generations, four body styles, and one grand touring mission. The right 6 Series depends on which engine you choose -and how much you're prepared to spend keeping it on the road.
| 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 6 Series E63 vs F12
Every engine ever fitted to a BMW 6 Series -verified codes, specifications and real UK ownership data.
| Engine Code | Family | Fuel | Disp. | Power | Years | Gen. | Reliability | 2025 Enquiries | Avg. Recon Cost |
|---|---|---|---|---|---|---|---|---|---|
| N52B30 | N52 | Petrol | 3.0L | 258–272 bhp | 2003–2010 | E63/E64 | ★★★★★ | -(pattern data) | £2,500–£5,000 |
| N62B44 | N62 | Petrol | 4.4L | 333 bhp | 2004–2005 | E63/E64 | ★★★★★ | -(pattern data) | £4,000–£7,000 |
| N62B48 | N62 | Petrol | 4.8L | 367 bhp | 2005–2010 | E63/E64 | ★★★★★ | -(pattern data) | £4,500–£8,000 |
| S85B50 | S85 | Petrol | 5.0L | 507 bhp | 2005–2010 | E63/E64 (M6) | ★★★★★ | -(pattern data) | £8,000–£14,000 |
| M57D30 | M57 | Diesel | 3.0L | 286 bhp | 2007–2010 | E63/E64 | ★★★★★ | 830 JLR-wide [BMW-VERIFIED] | £4,500–£7,000 |
| N55B30 | N55 | Petrol | 3.0L | 320 PS | 2011–2018 | F06/F12/F13 | ★★★★★ | -(pattern data) | £3,800–£6,000 |
| N63B44 | N63 | Petrol | 4.4L | 407–450 PS | 2011–2018 | F06/F12/F13 | ★★★★★ | 440 JLR-wide [BMW-VERIFIED] | £6,000–£10,000 |
| S63B44 | S63 | Petrol | 4.4L | 560–600 PS | 2012–2018 | F06/F12/F13 (M6) | ★★★★★ | 410 JLR-wide [BMW-VERIFIED] | £9,000–£14,000 |
| B57D30 | B57 | Diesel | 3.0L | 313 PS | 2015–2023 | F06/F12/F13, G32 | ★★★½★ | 460 JLR-wide [BMW-VERIFIED] | £5,000–£8,000 |
| B47D20 | B47 | Diesel | 2.0L | 190 PS | 2017–2023 | G32 | ★★★★★ | 930 JLR-wide [BMW-VERIFIED] | £2,800–£4,500 |
Showing 10 of 12 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 6 Series range -symptoms, costs and urgency.
01The defining 6 Series issue -the N63 V8 suffers from premature valve stem seal wear, causing blue smoke on startup and excessive oil consumption. Affects F06/F12/F13 650i (2011–2018). BMW faced a class action over this defect. £6,000–£10,000 recon [BMW-QUOTE].
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02The predecessor to the N63 -the N62 V8 in the E63/E64 645Ci/650i suffers from the same valve stem seal issues. Blue smoke on startup is the classic symptom. £4,000–£8,000 recon.
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03The N63's hot-vee design leads to timing chain stretch and tensioner failure. Rattling noise on cold start is the early warning; ignored, chain slip destroys the engine. Affects F06/F12/F13 650i.
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04The E63/E64 M6's V10 is a masterpiece -but rod bearing wear and SMG III pump failure are the defining risks. Rod bearing replacement is £3,000–£5,000; SMG pump failure is £2,000–£4,000. Specialist-only work.
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05The E63/E64 era's common non-engine issues -cooling system plastic components degrade, and the complex electronics cause battery drain. Check coolant system condition on any E63/E64.
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06The modern B-family engines in the G32 Gran Turismo and late F-generation cars are the most dependable 6 Series engines ever made. No major failure patterns -just standard DPF and EGR maintenance on the diesels.
Learn moreCatastrophicstop driving, specialist inspection immediately
Immediatebook inspection now
Monitorbook inspection soon
Lowplan at next service
200++
Total Enquiries in 2025
[BMW-VERIFIED]
BMW 6 Series F06/F12/F13 enquiries
Rising -the B57 diesel cars entering affordable range[PLACEHOLDER -YoY %]
BMW 6 Series E63/E64 enquiries
Stable -enthusiast market, not failure-driven[PLACEHOLDER -YoY %]
BMW 6 Series G32 enquiries
Rising -newer cars entering warranty-exit age[PLACEHOLDER -YoY %]
N63B44 enquiries (JLR-wide)
Stable -the N63's reputation is well-known[PLACEHOLDER -YoY %]
B57D30 enquiries (JLR-wide)
Rising[PLACEHOLDER -YoY %]
Interesting insight: The 6 Series generates fewer enquiries than the 3 Series or 5 Series -but the enquiries it does generate are more expensive. The N63 V8 drives the majority of the volume, with owners facing £6,000–£10,000 recon bills on cars worth £12,000–£25,000. The diesel 640d owners, by contrast, barely feature in the data -the B57 is proving as robust as the M57 before it. (Editorial synthesis -specialist sense-check before publishing.)
F06/F12/F13 650i owners are the core of the 6 Series enquiry data -and the N63's valve stem seal and timing chain issues are the primary drivers. These cars are now entering affordable territory (£12,000–£18,000 for a 650i), but the £6,000–£10,000 recon bill means buyers need to budget accordingly. The 640d is the sensible choice; the 650i is the emotional one. (Editorial synthesis.)
The G32 Gran Turismo generates the fewest enquiries -and that's a good thing. The B-family engines are proving the most dependable 6 Series powertrains ever made. The G32 is the 6 Series for people who want the badge without the bills. (Editorial synthesis.)
Editorial Pull-Quote
“If you buy one 6 Series based on this page, buy an F06/F12/F13 640d with the B57 straight-six diesel -it's the most dependable engine in the range, returns 45+ mpg, and delivers the grand tourer experience without the V8 bills. If the V8 is calling you, budget £6,000–£10,000 for an N63 recon and buy the best warranty you can find. And on an E63/E64 N62, a documented valve stem seal replacement is worth more than any service stamp.”
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 |
|---|---|---|---|---|---|
| 630i (N52) | N52B30 | £1,200–£2,800 | £2,500–£5,000 | £4,000–£6,500 | 10–14 hrs |
| 645Ci (N62) | N62B44 | £2,000–£4,000 | £4,000–£7,000 | £6,000–£9,500 | 16–20 hrs |
| 650i (N62) | N62B48 | £2,500–£4,500 | £4,500–£8,000 | £6,500–£10,000 | 16–20 hrs |
| 635d (M57) | M57D30 | £2,500–£4,500 | £4,500–£7,000 | £6,000–£9,000 | 12–16 hrs |
| M6 (S85 V10) | S85B50 | £4,000–£8,000 | £8,000–£14,000 | £12,000–£18,000 | 18–24 hrs |
N47D20C, B47D20A, N57D30, B58B30 figures [BMW-QUOTE]; older engines [PLACEHOLDER - confirm vs cost sheet].
Fitting a BMW 6 Series engine typically takes 10–22 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [BMW-QUOTE]. The 6 Series rule -the grand tourer premium: A £6,000–£10,000 N63 recon against a £15,000 F06 650i sits at 40–67% of the car's value -⚠️ watch. Against a £50,000 F13 M6, the same S63 recon at £9,000–£14,000 is just 18–28% -✅ safe. Against a £6,000 E63 650i, a £4,500–£8,000 N62 recon is 75–133% -❌ walk away, or buy a used engine and accept the risk. Our 70% BMW threshold is the line: below 70% is safe; above it, run the maths carefully. Value the car first, then the engine. The 640d's B57 recon at £5,000–£8,000 sits at 33–53% of a £15,000 F12 -safe and sensible.
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 revived the 6 Series after 14 years -the N62 V8 was the flagship engine, the S85 V10 was the M car, and the M57 diesel arrived in 2007 for economy.
The N62's valve stem seals are the defining issue -every E63/E64 V8 owner faces this risk. The 630i with the N52 straight-six is the robust pick; the 635d with the M57 is the sensible diesel.
The F-generation brought turbocharging to the 6 Series -the N55 straight-six replaced the N52, the N63 twin-turbo V8 replaced the N62, and the B57 diesel arrived in the LCI.
The N63's hot-vee design created new failure modes -valve stem seals, timing chain stretch, and oil consumption. The B57 diesel is the reliable choice; the N55 is the sweet spot.
The G32 Gran Turismo moved the 6 Series to the CLAR platform -B-family engines only, no N-series carryover. The 640i with the B58 is the petrol pick; the 630d/640d with the B57 is the diesel.
The B-family engines are the most dependable 6 Series powertrains ever made -no chain caveat, no V8 valve seal issues. The G32 is the sensible 6 Series; the F06 is the beautiful one.
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 6 Series is perfect for - and who should think twice.
The 6 Series is built for this -long-distance cruising in luxury. The F06/F12/F13 640d with the B57 is the perfect GT: 45+ mpg, 600-mile range, and wafting comfort. The 640i with N55 is the petrol alternative; the V8s are for the emotionally committed.
The 6 Series is a grand tourer, not a commuter car -it's long, wide, and thirsty (especially the V8s). The G32 Gran Turismo is the most practical, but the 5 Series does the commuting job better. Buy a 640d if you must, but the 5 Series is the sensible choice.
The most dangerous badge on this site for a tight budget. A £6,000 E63 650i is not a cheap 6 Series -it's an expensive one with the first year's bills prepaid by nobody. A £15,000 F06 640d is the bargain; a £8,000 650i without a warranty is the trap.
The M6 with the S63 V8 is the full-fat experience -560–600 bhp, 3.9s to 60, and a V8 roar that justifies the bills. The F13 M6 is the one to buy; the E63 M6 with the S85 V10 is a masterpiece but carries rod bearing risk. Buy the best warranty you can find.
The E63/E64 630i with the N52 is a rising classic -the last naturally-aspirated straight-six in a 6 Series. The F13 M6 with the S63 is a future classic. Both are worth proper engine investment; the N52 is the keeper, the M6 is the investment.
Real talk. The right BMW 6 Series 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.
Blue smoke on startup from an N63? Rod bearing noise on an S85?
On the 6 Series, the answer swings on your car's value and which engine you have -a £6,000 E63 and a £50,000 F13 face very different economics. 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 6 Series 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 - 200+ BMW 6 Series enquiries in 2025 alone [BMW-VERIFIED] -covering three generations and four body styles. Nobody has seen more UK 6 Series engine decisions across the full range.
We Tell You When Not to Repair - On a tired E63 N62 without seal history, 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 N63 valve stem seal diagnostics, N62 rebuilds, S85 rod bearing assessment, and S63 M-car servicing. Not generalist garages -BMW-focused workshops with grand tourer experience.
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Read our in-depth BMW 3 Series vs 5 Series reliability guide.
Everything you need to choose with confidence.
Data. Honesty. Specialists. All in one place.
Three generations, four body styles, one grand tourer mission.
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