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Plan d’maintenance BMW M8 Convertible (F91)
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📖BMW M8 Convertible F91 (2019-2022): open-top 625 hp flagship combining M xDrive traction with grand-touring luxury

BMW M8 Convertible (F91) (2019-2022)

Introduced in 2019, the BMW M8 Convertible F91 assumed the role of BMW’s open-top flagship, packing a 4.4-litre twin-turbo S63B44Tx V8 developing 600 hp in standard guise and 625 hp in Competition specification. Equipped with the rear-biased M xDrive all-wheel-drive system and an active M differential, it dispatched 0-62 mph in just 3.3 seconds. Sustaining this high-tech convertible requires meticulous BMW M8 maintenance, with a sharp focus on drivetrain fluids and thermal management.

Power is managed by an eight-speed M Steptronic torque-converter automatic transmission (ZF 8HP) featuring Drivelogic, replacing the dual-clutch units of previous generations for smoother low-speed manners. The twin-turbo V8 produces intense heat within the engine bay, necessitating regular inspection of turbo coolant hoses, oil feed lines, and ignition coil packs.

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Owner notes

The reassuring points, known weak spots and deadlines you should not let slip.

Reassuring points

Reliability
  • Explosive all-weather acceleration and selectable 2WD rear-wheel-drive mode via M xDrive.
  • Outstanding low-speed refinement and rapid highway shifting from the eight-speed M Steptronic gearbox.
  • Exceptional sound insulation and rapid folding cycle from the multi-layer acoustic soft-top.

Chronic weak spots

Keep an eye on
  • Turbocharger cooling lines: check plastic junctions in the engine valley for signs of thermal fatigue.
  • M xDrive transfer box: ensure tyres have matching tread depth across both axles to avoid transfer clutch strain.
  • Ignition coils and spark plugs: monitor for high-load misfires under full boost pressure.
  • Convertible roof drainage channels: verify that drain tubes behind the rear wheel arches remain free of debris.
  • Ceramic or composite brake discs: inspect disc surfaces and brake pads under the car's 2,085 kg weight.

Critical deadlines

Do not miss
  • Engine oil and filter change: every 10,000 to 12,000 km or 12 months with BMW LL-01 / LL-12 FE oil.
  • Spark plug replacement: every 30,000 km to safeguard ignition coils and engine stability.
  • M xDrive transfer box and differential fluid service: every 60,000 km.
  • M Steptronic transmission fluid service: recommended every 80,000 km.

Fréquences d'maintenance recommandées

Service markers for petrol/diesel versions. Exact intervals vary by engine and model year.

Oil change

Every 15 000 km

Every 1 year

Service

Every 15 000 km

Every 1 year

Brake pads

Every 30 000 km

Every 2 years

Poids ou puissance élevés : usure des number platettes accélérée sur certaines versions

Timing belt / chain

Timing chain - designed to last, no scheduled replacement

Battery (12 V)

Every 50 000 km

Every 4 years

Powertrains and average consumption

Average consumption from manufacturer data for the versions available in this generation.

Petrol and diesel powertrains
▾

Petrol, diesel or LPG versions. The intervals shown cover the usual mechanical jobs.

M8 Cabriolet (F91)

Estimated average budget

Premium cost

Servicing a BMW M8 Convertible (F91) sits about 78% above the market average (premium positioning).

Simple oil change~185 €
Full service~520 €
Front brake pads~250 €
Tyres (set of 4)~570 €

Timing chain: no scheduled replacement.

* Indicative estimates for parts and labour.

Frequently asked questions about BMW M8 Convertible (F91)

What are the common problems on the M8 Convertible (F91)?▾
M8 Convertible (F91) owners should especially watch: Turbocharger cooling lines: check plastic junctions in the engine valley for signs of thermal fatigue. M xDrive transfer box: ensure tyres have matching tread depth across both axles to avoid transfer clutch strain. Garajo includes these watch points so you can act early.
Does the M8 Convertible (F91) timing chain need to be replaced?▾
The M8 Convertible (F91) engine uses a timing chain designed to last the life of the engine, with no scheduled replacement. Listening for noise during a service is enough.
Where can I find the service book for the BMW M8 Convertible (F91)?▾
Garajo offers a free digital service book, always up to date, with reminders and a detailed history for your BMW M8 Convertible (F91).
How much does it cost to service a BMW M8 Convertible (F91)?▾
The service budget for a BMW M8 Convertible (F91) sits about 78% above the market average (premium positioning). Allow about 520 € for a full service, for example. Garajo estimates your budget by powertrain and tracks what you actually spend, for free.
Which BMW M8 Convertible (F91) powertrain is best for town use?▾
This model is only available as petrol/diesel. Fuel mix: 2 petrol versions. In town, prefer the most economical, well-serviced petrol/diesel version.
Which BMW M8 Convertible (F91) powertrain should you choose if you mostly drive on the motorway?▾
This model is only available as petrol/diesel. Fuel mix: 2 petrol versions. On the motorway, prefer petrol/diesel versions with the best power-to-consumption compromise.

Compatible engine oil

Which engine oil for BMW M8 Convertible (F91)?

These links are limited to the engines of this generation when oil data is available.

Unsure between two viscosities?5W-30 vs 0W-300W-20 vs 0W-305W-40 vs 0W-40
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