The BMW 6 Series F12 and F13 represent some of the most striking grand tourers BMW has produced in the modern era. Launched in 2011 as the spiritual successor to the E63/E64 generation, the F12 (convertible) and F13 (coupe) combine aggressive styling with genuine long-distance comfort and serious performance credentials. Later joined by the F06 Gran Coupe in 2012, this family of cars positioned itself squarely against the Mercedes-Benz E-Class Coupe and Audi A7.
For buyers in the US market, the F12/F13 represents an increasingly affordable entry point into BMW's luxury performance segment. Prices have dropped significantly since 2011, making a used 640i or 650i a genuinely tempting proposition. But as with any complex European luxury vehicle, ownership costs can escalate quickly without proper due diligence.
This guide covers everything you need to know about the BMW 6 Series F12/F13 reliability, including known issues by engine variant, maintenance intervals, and which parts to prioritize when buying used.
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The BMW F12/F13 generation was produced from 2011 to 2018, replacing the E63/E64 platform. The F13 two-door coupe and F12 convertible shared the same underpinnings as the F10 5 Series, giving buyers access to a proven chassis architecture. The performance-oriented M6 (F12M/F13M) arrived in 2012, powered by the high-revving S63 V8 engine.
A mid-cycle refresh in 2015 brought revised front and rear styling, updated iDrive software, and minor suspension tuning changes. The range was discontinued in 2018 when BMW phased out traditional 6 Series coupes in favor of the 8 Series.
| Engine | Displacement | Power | Torque | 0-60 mph | Notes |
|---|---|---|---|---|---|
| 640i (N55) | 3.0L Turbo I6 | 315 hp | 332 lb-ft | 5.0 sec | Most common US variant |
| 650i (N63) | 4.4L Twin-Turbo V8 | 445 hp | 480 lb-ft | 4.5 sec | Higher running costs |
| M6 (S63) | 4.4L Twin-Turbo V8 | 560 hp | 502 lb-ft | 4.0 sec | Track-capable, complex |
| 640d (N57) | 3.0L Turbo Diesel I6 | 313 hp | 465 lb-ft | 5.4 sec | Europe/export only |
How to Check a Used BMW 6 Series (F12/F13) History
Before buying a used BMW 6 Series F12 or F13, it is essential to ensure full transparency about its past. Undisclosed accidents can hide poor-quality repairs that directly compromise the safety of the driver and passengers.
The F12/F13 platform is particularly vulnerable to hidden damage due to its complex soft-top mechanism on convertible models, its wide body panels, and its sophisticated electronic suspension components. A poorly repaired rear-end collision, for example, may leave the adaptive dampers or integral active steering system misaligned without any warning light appearing at first. Unreplaced side airbags, disguised paintwork on the carbon fiber roof panel on the M6, or hastily welded subframe mounting points are all risks invisible to the naked eye on a casual inspection. It is therefore strongly recommended to check the vehicle's complete history using its license plate or VIN number before making any purchase decision.
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Key Strengths
The BMW 6 Series F12/F13 has a great deal to offer as a used buy when selected carefully.
The N55 inline-six engine in the 640i is widely regarded as one of BMW's most robust modern power units, combining single-turbo simplicity with strong real-world performance. It shares significant DNA with engines used across the 3 Series and 5 Series lineup, meaning parts availability is excellent and independent mechanics are familiar with it.
The platform itself, shared with the F10 5 Series, is a well-sorted grand tourer chassis with genuine long-distance capability. Build quality on the interior is excellent, and the ZF 8-speed automatic gearbox fitted across the range is both smooth and highly durable.
Depreciation has been steep, meaning buyers in 2024 can access a genuinely exotic-looking grand tourer at a fraction of its original MSRP. For enthusiasts willing to stay on top of maintenance, the F12/F13 offers a compelling combination of style, comfort, and performance at a competitive used price point.
Known Reliability Issues
640i — N55
The N55 3.0L turbocharged inline-six is the most reliable engine in the F12/F13 range and the recommended choice for used buyers. That said, it is not without its known issues.
High-pressure fuel pump (HPFP) failure — Symptom: rough idle, hesitation under acceleration, misfires. Cause: fuel pump wear or internal failure. Severity: Critical. Typically appears between 60,000 and 90,000 miles.
Valve cover gasket and oil separator leaks — Symptom: burning oil smell, visible oil residue near the engine top. Cause: heat cycling degrades the gasket and the crankcase ventilation (CCV) system. Severity: Moderate. Common from 50,000 miles onward.
Charge pipe failure — Symptom: sudden loss of power, boost pressure drop. Cause: the plastic charge pipe connecting the turbo to the intercooler cracks under pressure. Severity: Moderate. Frequently reported between 40,000 and 70,000 miles.
Thermostat and coolant system failures — Symptom: temperature gauge fluctuations, coolant loss, overheating. Cause: the electric thermostat and plastic coolant pipes are known weak points. Severity: Critical if ignored. Watch from 60,000 miles.
650i — N63
The N63 4.4L twin-turbocharged V8 delivers exceptional performance but comes with a significantly more challenging reliability profile. BMW itself issued a Customer Care Package (CCP) for N63-equipped vehicles, covering several known defects.
Valve stem seal failure and excessive oil consumption — Symptom: blue smoke on startup or deceleration, oil burning smell, oil level dropping rapidly. Cause: premature seal wear due to turbo heat. Severity: Critical. Can appear as early as 30,000 to 50,000 miles.
Turbocharger failure — Symptom: reduced power, oil in intake, whining noise. Cause: the N63's "hot V" turbo layout places the turbos inside the engine valley, generating extreme heat. Severity: Critical. Reported from 60,000 to 100,000 miles.
High-pressure fuel pump wear — Same pattern as the N55 but more costly due to V8 configuration. Severity: Critical. Common from 50,000 miles.
Fuel injector failure — Symptom: rough running, misfires, fuel smell. Cause: injector tip deposits or electrical failure. Severity: Moderate. Common from 70,000 miles.
Always verify that any N63-equipped F12/F13 has had its BMW Customer Care Package work completed before purchase.
M6 — S63
The S63 high-performance V8 in the M6 is a heavily modified version of the N63. It shares many of the same thermal management challenges but adds competition-level components that require specialist attention.
Rod bearing wear — Symptom: knocking noise at idle or under load. Cause: factory rod bearings are undersized for sustained high-RPM use. Severity: Critical. Typically surfaces between 40,000 and 70,000 miles on cars that have seen track use.
Oil consumption and turbo heat soak — Identical pattern to the N63 but accelerated under performance driving conditions. Severity: Critical on track-used examples.
SMG/DCT transmission wear — Symptom: harsh shifts, hesitation, paddle shift delay. Cause: clutch wear and mechatronics fluid degradation. Severity: Moderate to Critical. Recommend fluid service every 30,000 miles.
Chassis Issues
Rear subframe bushings — The F12/F13 shares the F10's rear subframe design. Bushing wear leads to vague steering response and clunking over bumps. Common from 60,000 to 80,000 miles.
Front control arm bushings — Premature wear causes tramlining and uneven tire wear. Severity: Moderate. Typically from 50,000 miles.
Air suspension / adaptive dampers (optional) — On cars equipped with Electronic Damper Control (EDC), failed shock absorbers are expensive to replace. Severity: Moderate to Critical. Common from 70,000 miles.
Electronics and Software
Soft-top hydraulic system (F12 convertible) — Hydraulic pump failure or cylinder seal leaks cause the roof to operate slowly or stop mid-cycle. Severity: Moderate. Common from 50,000 miles.
iDrive CIC/NBT module faults — Random freezes, screen flickering, or complete module failure. Severity: Minor to Moderate. Typically from 60,000 miles onward.
Footwell module (FRM) failure — Symptom: random lighting failures, windows and mirrors not responding. Cause: water ingress or software corruption. Severity: Moderate.
Maintenance and Servicing
The BMW 6 Series F12/F13 is built around BMW's Condition Based Service (CBS) system, which adjusts oil change intervals based on driving style. In practice, a 7,500-mile oil change interval using BMW-approved full synthetic 5W-30 is recommended for used examples, rather than relying on the 15,000-mile factory interval.
Key service intervals to observe:
- Oil and filter change: every 7,500 miles (used car best practice)
- Spark plugs: every 30,000 miles (critical on N63 and S63 to prevent coil damage)
- Brake fluid flush: every 2 years
- Coolant flush: every 4 years
- Transmission fluid (ZF 8HP): every 50,000 miles, despite BMW's "lifetime fill" claim
- Differential fluid: every 50,000 miles
Average service costs in the US independent market range from $250 to $450 for a standard oil service, rising to $800 to $1,500+ for major services on N63 or S63 engines. Budget for an annual maintenance fund of $1,500 to $3,000 depending on variant and mileage.
Parts to Watch and Replace First
Valve cover gasket and CCV system — Oil leaks from this area are nearly universal on high-mileage N55 engines. Replace proactively to avoid secondary damage.
Charge pipe (N55) — The OEM plastic charge pipe is a known failure point. An upgraded aluminum or silicone replacement is a cost-effective first modification.
Thermostat and coolant hoses — Plastic components throughout the cooling system degrade with age. Replace the full cooling system kit as preventive maintenance above 80,000 miles.
Spark plugs and ignition coils — Degraded plugs accelerate coil wear. Always replace both together, especially on N63 and S63 variants.
Fuel injectors (N63/S63) — Verify condition before purchase. Replacement is expensive on the V8 due to labor hours.
Rear subframe and control arm bushings — These wear silently and have a major impact on handling dynamics and tire wear.
Soft-top hydraulic pump (F12) — Inspect the convertible roof operation carefully during any test drive. Hydraulic repairs are labor-intensive.
Front lower control arms — Budget for a full front suspension refresh on any example over 80,000 miles.
FAQ
Is the BMW 6 Series F12/F13 reliable?
The F12/F13 is moderately reliable for its segment when properly maintained. The 640i with the N55 engine is the most dependable variant. The 650i and M6 with N63/S63 engines are significantly more complex and prone to expensive failures, particularly related to oil consumption and turbocharger wear.
What is the best engine option in the F12/F13?
For reliability and running costs, the N55-powered 640i is the clear choice. It delivers strong performance with a simpler single-turbo layout and excellent parts availability. Buyers seeking maximum performance should approach the N63 and S63 variants with a thorough pre-purchase inspection and a larger maintenance budget.
How many miles will a BMW 6 Series F12/F13 last?
A well-maintained 640i can realistically reach 150,000 to 200,000 miles. The N63-powered 650i typically requires more frequent major repairs, and high-mileage examples above 100,000 miles should be approached with extra caution unless full service records are available.
Is the BMW 6 Series F12/F13 expensive to maintain?
Yes, especially for the V8 variants. Annual maintenance costs typically range from $1,500 to $3,000 for the 640i and can exceed $4,000 to $5,000+ for N63 or M6 examples. Always factor in the cost of the BMW Customer Care Package repairs on N63-powered cars if not already completed.
What should I check before buying a used F12/F13?
Prioritize a full vehicle history check, a pre-purchase inspection by a BMW specialist, verification of CBS service records, compression and oil consumption tests on V8 models, and a full operational test of the convertible roof mechanism on F12 examples. Also check for evidence of N63 Customer Care Package completion on 650i models.
Which year is the best to buy?
Post-facelift models from 2015 onward benefit from revised software and minor engineering improvements. For the 640i specifically, any well-documented example from 2012 onward with under 80,000 miles and a full service history is a solid starting point.
Conclusion
The BMW 6 Series F12/F13 earns a reliability score of 6.5/10 overall — rising to 7.5/10 for the 640i and dropping to 5.5/10 for the N63-powered 650i and M6. It is a genuinely rewarding grand tourer that rewards careful buyers who select the right variant, verify the service history, and budget realistically for ownership costs. Browse our catalog for quality replacement and maintenance parts for the F12/F13 to keep yours running at its best.