BMW 6 Series F06Fastback2011–2018
Every engine fitted to the 6 Series Gran Coupé F06 — from the 3.0-litre N55 straight-six in the 640i, to the 4.4-litre twin-turbo V8 in the 650i, the 313 bhp N57 diesel in the 640d, and the fire-breathing S63 V8 in the M6.
Real UK costs, honest failure data, and the 2015 facelift that kept BMW's most elegant four-door coupé relevant.
Backed by 120+ real UK F06 enquiries in 2025 [BMW-VERIFIED].
Engine Database
Every engine fitted to the F06 Gran Coupé — from the entry-level 640i to the range-topping M6, including the 640d diesel that was specially built for European customers.
Overview
The BMW 6 Series Gran Coupé F06 is the four-door fastback variant of the third-generation 6 Series, launched in June 2012 at the Geneva International Motor Show. Designed by Nader Faghihzadeh, the F06 shares its platform with the F10 5 Series and features a wheelbase 4.6 inches longer than the F13 coupé, with a 4+1 seating arrangement. The engine range includes the N55 straight-six petrol in the 640i, the N63 V8 in the 650i, the N57 straight-six diesel in the 640d, and the S63 V8 in the M6.
A 2015 facelift brought subtle styling updates while the engine line-up remained unchanged. Production ended in 2018, succeeded by the 8 Series Gran Coupé.
Key Facts
Market Intelligence
The BMW 6 Series F06 generated 120 real UK engine enquiries in 2025 [EM-VERIFIED], concentrated on the N63 V8s and N57 diesels as these cars age out of warranty.
04Best & Worst Engines
Best Diesel Overall
N57D30B (640d, 2011–2018)
“The 3.0-litre straight-six diesel produces 313 PS and 630 Nm — effortless, refined, and with the kind of torque that makes the F06 a genuine long-distance cruiser. The N57 is chain-driven and proven across the BMW range. In the Gran Coupé, it's the diesel you buy if you want six-cylinder refinement without V8 running costs.”
Who it's for: buyers who want effortless torque and 40+ mpg potential.
Best Petrol Overall
N55B30A (640i, 2011–2018)
“The N55 is BMW's single-turbo straight-six that replaced the N54 — 320 PS, twin-scroll turbo, and significantly more reliable than its predecessor. The F06 was one of the last models to receive the N55 before the B58 took over. It's the petrol you can buy without HPFP anxiety.”
Who it's for: buyers who want six-cylinder petrol performance without the N63's V8 running costs. (Model-wide: B58B30 in the G30/G32 sets the modern benchmark — see G30 →)
Highest Risk
N63B44A / N63B44B (650i, all years)
“The hot-vee V8 suffers from heat-related failures — valve stem seals, turbo coolant lines, and battery drain are common. The N63 has a well-earned reputation for high ownership costs. The 650i is fast, but it's expensive to keep fast.”
Who it's for: buyers with deep pockets who want V8 performance and are prepared for the maintenance bills.
Most Expensive Failure
S63B44B (M6)
“The S63 is the high-performance version of the N63 — 560–575 PS, twin-turbo, and even more complex. Valve stem seal failure, turbocharger wear, and the 7-speed DCT transmission all add to the ownership cost. A full engine replacement sits at £8,000–£14,000.”
Who it's for: M6 buyers who budget for high-end maintenance and have a specialist they trust.
Best Value
N57D30B (640d, 2011–2018)
“The 640d offers 313 PS, 630 Nm, and 40+ mpg potential — it's the most efficient engine in the range and the cheapest to replace of the six-cylinder options. The N57 is robust, the chain is accessible, and the F06's weight doesn't overwhelm it.”
Who it's for: buyers who want the best balance of performance, economy, and reliability.
Most Overlooked
N55B30A (640i, 2011–2018)
“The 640i is often overshadowed by the V8 650i and the M6, but the N55 straight-six is the most dependable petrol engine in the range. 320 PS and 450 Nm is more than enough for the F06's grand touring mission, and running costs are significantly lower than the V8s.”
Who it's for: buyers who want petrol refinement without the V8's running costs.
Best Diesel Overall
N57D30B
(640d, 2011–2018)
“The 3.0-litre straight-six diesel produces 313 PS and 630 Nm — effortless, refined, and with the kind of torque that makes the F06 a genuine long-distance cruiser. The N57 is chain-driven and proven across the BMW range. In the Gran Coupé, it's the diesel you buy if you want six-cylinder refinement without V8 running costs.”
Who it's for: buyers who want effortless torque and 40+ mpg potential.
Best Petrol Overall
N55B30A
(640i, 2011–2018)
“The N55 is BMW's single-turbo straight-six that replaced the N54 — 320 PS, twin-scroll turbo, and significantly more reliable than its predecessor. The F06 was one of the last models to receive the N55 before the B58 took over. It's the petrol you can buy without HPFP anxiety.”
Who it's for: buyers who want six-cylinder petrol performance without the N63's V8 running costs. (Model-wide: B58B30 in the G30/G32 sets the modern benchmark — see G30 →)
Highest Risk
N63B44A
/ N63B44B (650i, all years)
“The hot-vee V8 suffers from heat-related failures — valve stem seals, turbo coolant lines, and battery drain are common. The N63 has a well-earned reputation for high ownership costs. The 650i is fast, but it's expensive to keep fast.”
Who it's for: buyers with deep pockets who want V8 performance and are prepared for the maintenance bills.
Most Expensive Failure
S63B44B
(M6)
“The S63 is the high-performance version of the N63 — 560–575 PS, twin-turbo, and even more complex. Valve stem seal failure, turbocharger wear, and the 7-speed DCT transmission all add to the ownership cost. A full engine replacement sits at £8,000–£14,000.”
Who it's for: M6 buyers who budget for high-end maintenance and have a specialist they trust.
Best Value
N57D30B
(640d, 2011–2018)
“The 640d offers 313 PS, 630 Nm, and 40+ mpg potential — it's the most efficient engine in the range and the cheapest to replace of the six-cylinder options. The N57 is robust, the chain is accessible, and the F06's weight doesn't overwhelm it.”
Who it's for: buyers who want the best balance of performance, economy, and reliability.
Most Overlooked
N55B30A (640i, 2011–2018)
“The 640i is often overshadowed by the V8 650i and the M6, but the N55 straight-six is the most dependable petrol engine in the range. 320 PS and 450 Nm is more than enough for the F06's grand touring mission, and running costs are significantly lower than the V8s.”
Who it's for: buyers who want petrol refinement without the V8's running costs.
Engine
Typical Mileage
Common Major Failure
Repair Cost (Specialist)
Replacement Cost (Recon)
Ownership Verdict
Best Petrol -320 PS, proven, dependable
Highest Risk -449 PS, high ownership costs
High Risk -same N63 issues, slightly cheaperBest Diesel -313 PS, efficient, dependableMost Expensive -560 PS, M-division costsEngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership VerdictBest Petrol -320 PS, proven, dependableHighest Risk -449 PS, high ownership costsHigh Risk -same N63 issues, slightly cheaperBest Diesel -313 PS, efficient, dependableMost Expensive -560 PS, M-division costs
The F06 rule
A £4,500–£7,000 N57 recon against a £8,000–£25,000 F06 sits at 18–87% of the car's value. On a sub-£10,000 F06, that brushes our 70% BMW threshold -we'll honestly tell you to walk away. Against a well-kept £20,000+ low-mileage example, the same recon drops to a routine 22–35% -a repair decision, not a financial one. For an N63 650i or S63 M6, the economics are less favourable -value the car first, and always budget for N63-specific maintenance.
N63
Valve Stem Seal Failure (650i)
Affected models:
F06 650i (2011–2018, N63B44A and N63B44B).
Typical failure mileage:
50,000–100,000 miles.
Root cause:
The N63's hot-vee design (turbochargers located in the V of the engine) creates significant heat -valve stem seals can harden and fail, leading to oil consumption, blue smoke on startup, and eventually, catalytic converter damage. This is the defining issue of the N63 across all BMW models.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£4,000–£7,000
£3,000–£6,000
Catastrophic (Replacement)
Dealer
Specialist
£10,000–£14,000
£6,000–£10,000
Our Recommendation
On any N63-powered F06, have the valve stem seals inspected at 50,000 miles -a £3,000–£6,000 preventative repair is dramatically cheaper than the £6,000–£10,000 engine replacement that follows if ignored. This is the defining ownership cost of the 650i.
S63
Valve Stem Seal & Turbocharger Wear (M6)
Affected models:
F06 M6 (2012–2018, S63B44B).
Typical failure mileage:
50,000–100,000 miles.
Root cause:
The S63 shares the N63's hot-vee architecture but with higher outputs -valve stem seal failure is common, and the turbochargers can suffer from wear due to the increased boost pressures. The 7-speed DCT transmission also requires specialist maintenance.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£5,000–£8,000
£4,000–£7,000
Catastrophic (Replacement)
Dealer
Specialist
£12,000–£18,000
£8,000–£14,000
Our Recommendation
On any S63-powered M6, have the valve stem seals and turbochargers inspected at 50,000 miles -a £4,000–£7,000 preventative service is dramatically cheaper than the £8,000–£14,000 engine replacement that follows if ignored. The M6 is rewarding but requires serious maintenance commitment.
N57D30B
Timing Chain & DPF Issues (640d)
Affected models:
F06 640d (2011–2018, N57D30B).
Typical failure mileage:
80,000–150,000 miles.
Root cause:
The N57 is generally robust, but the timing chain can wear on higher-mileage examples. Like all modern diesels, the DPF can clog with urban use if regeneration cycles cannot complete. The N57 is significantly more reliable than the N47, but these are the issues to watch for.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£1,000–£2,000
£800–£1,500
Catastrophic (Replacement)
Dealer
Specialist
£6,000–£8,000
£4,500–£7,000
Our Recommendation
On any N57-powered F06, have the timing chain inspected at 80,000 miles and ensure regular motorway runs to allow DPF regeneration. An £800–£1,500 preventative service is far cheaper than the £4,500–£7,000 replacement that follows if ignored.
Air
Suspension Compressor Failure (rear air suspension)
Affected models:
F06 models with optional rear air suspension (self-levelling).
Typical failure mileage:
60,000–120,000 miles.
Root cause:
The rear air suspension compressor can fail with age -the compressor motor seals deteriorate, leading to longer pump times, overheating, and eventual failure. The car may sit low at the rear or fail to level.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£800–£1,400
£500–£900
Catastrophic (Replacement)
Dealer
Specialist
£1,800–£2,800
£1,200–£1,800
Our Recommendation
Have the air suspension system leak-tested at every service on F06s over 60,000 miles -a £500–£900 compressor repair is cheap insurance against the £1,200–£1,800 full system overhaul that follows if ignored.
VariantEngine Code
Used (Supply)
Reconditioned (Supply)
Rebuilt (Supply)
Labour Hours
Diesel Variants
Petrol Variants
Scope note: All variants listed are F06 Gran Coupé (four-door fastback) only. F12 Convertible and F13 Coupé share most of these engines but are covered on their own Generation Pages. The 640i uses the N55B30A (320 PS). The 650i uses the N63B44B (449 PS), with early production using N63B44A (408 PS) and some markets receiving the N63B40A (408 PS, 4.0L). The 640d uses the N57D30B (313 PS). The M6 uses the S63B44B (560–575 PS). xDrive (all-wheel drive) was available as an option on most variants. The F06 Gran Coupé features a 4+1 seating arrangement with two full-size rear seats and one smaller rear middle seat.
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,500–£10,000 supply only
[BMW‑QUOTE]
Most Common Failures
Live FeedBMW 640d F06
N57
Manchester
Timing chain inspection4
enquiries
Updated MonthlyBMW 650i F06
N63
BirminghamOil consumption check3
enquiries
Updated MonthlyBMW M6 F06
S63
LondonTurbocharger inspection2
enquiries
Updated MonthlyMost Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,500–£10,000 supply only
[BMW‑QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,500–£10,000 supply only
[BMW‑QUOTE]
Most Common Failures
Diesel Variants
Petrol Variants
Scope note: All variants listed are F06 Gran Coupé (four-door fastback) only. F12 Convertible and F13 Coupé share most of these engines but are covered on their own Generation Pages. The 640i uses the N55B30A (320 PS). The 650i uses the N63B44B (449 PS), with early production using N63B44A (408 PS) and some markets receiving the N63B40A (408 PS, 4.0L). The 640d uses the N57D30B (313 PS). The M6 uses the S63B44B (560–575 PS). xDrive (all-wheel drive) was available as an option on most variants. The F06 Gran Coupé features a 4+1 seating arrangement with two full-size rear seats and one smaller rear middle seat.
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,500–£10,000 supply only
[BMW‑QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,500–£10,000 supply only
[BMW‑QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,500–£10,000 supply only
[BMW‑QUOTE]
Most Common Failures
Live FeedBMW 640d F06
N57
ManchesterTiming chain inspection4
enquiries
BMW 650i F06
N63
BirminghamOil consumption check3
enquiries
BMW M6 F06
S63
LondonTurbocharger inspection2
enquiries
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