Generations
E24 — E24
1981–1989
3.5L Straight-Six
E63 — E63/E64
2004–2010
3.0L Straight-Six, 3.0L Twin-Turbo, 4.8L V8, 5.0L V10 M5, 3.0L Diesel
F06 — F06 Gran Coupe (2012-2018)
2012–2018
2.0L Turbo, 3.0L Turbo, 4.4L Twin-Turbo V8, 3.0L Diesel, 2.0L Diesel
F12 — F12 Coupe/Convertible (2011-2018)
2011–2018
2.0L Turbo, 3.0L Turbo, 4.4L Twin-Turbo V8, 3.0L Diesel, 2.0L Diesel
Top issues to watch for
The most serious BMW 6 Series problems ranked by severity. We track 10 known issues — here are the ones you need to know about first.
Dangerous
Rod bearing failure (E63 S85)
The S85 5.0-litre V10 engine uses plain shell bearings between the connecting rods and crankshaft that are undersized for the engine's power output and rpm capability. These bearings experience accelerated wear due to oil starvation during high-rpm operation and inadequate oil flow to bearing surfaces. Rod bearing failure sends metal debris throughout the lubrication system, destroying the engine beyond economical repair. This is the same catastrophic failure mode documented extensively on the E60 M5 with identical S85 engine.
What happens if ignoredRod bearing failure destroys the engine within minutes of the initial knock appearing. Metal debris contaminates the entire lubrication system requiring a complete engine rebuild or replacement. Specialist rebuild costs £8,000-£15,000. The car becomes undriveable immediately and must not be started once knocking begins.
Specialist
£3,000–£10,000
Main dealer
£8,000–£15,000
Parts only
£1,500–£3,000
Dangerous
Brake pipe corrosion
BMW 6 Series models show brake pipe corrosion at 298.2 times the fleet average rate, with particular problems on V8 petrol variants where brake lines run close to exhaust manifolds and turbocharger heat shields. The combination of road salt exposure and heat cycling causes steel brake pipes to corrode internally and externally, leading to brake fluid leaks and potential brake failure. This is a safety-critical issue that causes immediate MOT failure and renders the vehicle dangerous to drive.
What happens if ignoredBrake pipe failure causes immediate and complete loss of braking ability on the affected circuit. Even minor leaks rapidly worsen under pressure and heat cycling. Complete brake failure while driving presents extreme danger to occupants and other road users. The car must not be driven with any suspected brake line damage.
Independent garage
£300–£600
Specialist
£400–£700
Main dealer
£600–£1,000
Parts only
£80–£200
Major
Valve stem seal failure (E63 N62)
The N62 4.8-litre V8 uses rubber valve stem seals that harden and shrink with age, allowing engine oil to leak past the valve guides into the combustion chambers. This is a well-documented design weakness on all N62 engines, exacerbated by the engine's complex variable valve timing system creating higher temperatures around the cylinder heads. Oil consumption can exceed 1 litre per 1,000 miles on severely affected engines. BMW issued Technical Service Bulletin SI B11 06 05 acknowledging the problem and specifying revised seal specifications.
What happens if ignoredSevere oil consumption leads to frequent top-ups and potential engine damage if oil level drops too low. Catalytic converters can be damaged by oil vapours, adding £800-£1,200 to repair costs. The car remains driveable but requires constant monitoring of oil level and frequent top-ups between services.
Specialist
£2,000–£4,000
Main dealer
£3,500–£6,000
Parts only
£300–£600
Major
VANOS issues (E63)
VANOS (Variable Nockenwellen Steuerung) is BMW's variable valve timing system using oil pressure to adjust camshaft timing for optimal performance and emissions. The system relies on small oil passages and precision solenoids that become blocked with carbon deposits from extended oil change intervals. Seals within the VANOS units deteriorate with age, causing erratic timing control that manifests as rough idle, poor cold running, and diagnostic trouble codes. Both N52 straight-six and N62 V8 engines are affected, with the V8 having two separate VANOS units.
What happens if ignoredVANOS failure causes poor drivability, increased emissions, and potential engine damage if timing becomes severely retarded. Poor fuel economy and rough running make the car unpleasant to drive. Complete VANOS unit replacement or rebuild is required, with V8 engines needing both intake and exhaust units replaced.
Independent garage
£400–£600
Specialist
£300–£800
Main dealer
£800–£1,200
Parts only
£200–£400
6 more known issues tracked
Including further major faults, wear items, electrical niggles, and generation-specific problems. Check a specific car to see which issues apply to its age and mileage.
Check a specific car →MOT failure hotspots
Based on DVSA MOT test data. These are the items where the BMW 6 Series fails at a significantly higher rate than the average car.
Transmission shaft flexible coupling deteriorated
Bodywork · 20-40k miles
MOT failure rate: 149x the fleet average
Sample: 4,310 tests
Headlight fault
Lights & Electrics · 80-100k miles
MOT failure rate: 44x the fleet average
Sample: 1,306 tests
Any fracture or welding defect on a wheel
Wheels · 80-100k miles
MOT failure rate: 27x the fleet average
Sample: 898 tests
Anti-roll bar links worn
Suspension · 120-150k miles
MOT failure rate: 7.2x the fleet average
Sample: 445 tests
Tyre cords visible or damaged
Tyres · 0-20k miles
MOT failure rate: 6.4x the fleet average
Sample: 676 tests
Emissions failure
Exhaust & Emissions · 20-40k miles
MOT failure rate: 5.6x the fleet average
Sample: 1,622 tests
Technical service bulletins & recalls
Official manufacturer notices issued to dealerships. If a car hasn't had recall work done, it needs doing — check with the dealer network.
SI B11 06 05
N62 Engine Oil Consumption
Addresses excessive oil consumption on N62 V8 engines. Revised valve stem seals and piston ring specification. Check oil consumption rate and request evidence of updated parts.
Buying a BMW 6 Series?
Check a specific car's service history to see if it's been looked after — franchised dealer records with dates, mileage, and work done.
Check service history£6.99 · Full refund if no records found
Related
BMW 6 Series reliability FAQs
What are the most common problems with the BMW 6 Series?
The BMW 6 Series has 10 known issues across 3 severity levels. The most serious are: Rod bearing failure (E63 S85), Brake pipe corrosion.
Is the BMW 6 Series reliable?
The BMW 6 Series has 2 dangerous and 7 major known issues. Most can be avoided with a thorough pre-purchase check and full service history.
How much does it cost to fix BMW 6 Series problems?
Costs vary by issue. Independent garages are typically 30-50% cheaper than main dealers for most repairs.
Which BMW 6 Series generation is most reliable?
The E24 (1981–1989) has the fewest dangerous issues (0). However, condition and service history matter more than generation — a well-maintained earlier car can be more reliable than a neglected newer one.