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Plan d’maintenance BMW 4 Series Convertible G23
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📖BMW 4 Series Convertible G23: a modern fabric-roof cabriolet where electronics match mechanical excellence

BMW 4 Series Convertible G23 (2020-Présent)

Introduced in late 2020, the BMW 4 Series Convertible G23 made a bold return to a multi-layer fabric roof, shedding 40 percent of the roof weight compared to the old metal hardtop while lowering the centre of gravity. Underpinned by the rigid CLAR platform, it delivers agile, engaging open-top handling. Preserving this high-tech convertible requires structured BMW 4 Series maintenance covering both mechanical fluids and digital vehicle networks.

Engine choices are powered by the robust modular B48 four-cylinder (420i, 430i) and glorious B58 straight-six (M440i), paired with a 48V mild-hybrid system and the seamless eight-speed ZF 8-speed automatic gearbox. Mechanically, these engines are exceptionally durable, but the cooling system with its fragile plastic cylinder head vent line requires monitoring.

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Owner notes

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

Reassuring points

Reliability
  • Innovative multi-layer fabric soft-top saves significant weight while providing outstanding acoustic comfort.
  • Stupendous B48 and B58 modular turbocharged engines delivering muscular performance and proven stamina.
  • Rigid CLAR chassis platform offering precise steering response and superb structural composure.

Chronic weak spots

Keep an eye on
  • Fabric roof weatherstripping and drains: inspect rear drainage channels and lubricate rubber seals annually.
  • Plastic cooling pipe connectors: check cylinder head coolant vent line for weeping or brittleness.
  • 12V auxiliary battery and 48V mild-hybrid system: weak low-voltage batteries cause driver assistance warning faults.
  • ZF 8-speed automatic gearbox: verify silky gear shifts and check service history on higher-mileage cars.
  • Tyres and brake wear: M Sport braking systems and staggered wide tyres wear quickly under enthusiastic use.

Critical deadlines

Do not miss
  • Brake fluid service: flush and replace every 24 months according to manufacturer specification.
  • ZF 8-speed automatic gearbox fluid service: renew fluid and integrated pan filter between 80,000 and 100,000 km.
  • Engine oil and filter renewal: every 15,000 km or 12 months with BMW Longlife-04 or LL-17 FE+ synthetic oil.
  • Spark plug replacement: replace every 50,000 km on B48 four-cylinder and B58 six-cylinder engines.

Fréquences d'maintenance recommandées

Petrol and diesel powertrains
▾

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 to 40 000 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

Hybrid powertrains
▾

Service markers for hybrid versions. Oil changes, brakes and system checks need to stay in step.

Oil change

Every 10 000 to 15 000 km

Every 1 year

Practical interval, shorter than the manufacturer's Longlife schedule to protect the engine

Service

Every 15 000 km

Every 1 year

Brake pads

Every 30 000 to 40 000 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

This generation is available with several powertrains. The consumption figures come from manufacturer data for each version.

Petrol and diesel powertrains
▾

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

Série 4 Cabriolet (G23 LCI, facelift 2024)

Série 4 Cabriolet (G23)

Hybrid powertrains
▾

HEV, MHEV and PHEV versions. They combine petrol/diesel servicing with hybrid-system checks.

Série 4 Cabriolet (G23 LCI, facelift 2024)

Série 4 Cabriolet (G23)

Estimated average budget

Premium cost

Servicing a BMW 4 Series Convertible G23 sits about 68% above the market average (premium positioning).

Simple oil change~185 €
Full service~520 €
Front brake pads~240 €
Tyres (set of 4)~495 €

Timing chain: no scheduled replacement.

* Indicative estimates for parts and labour.

Frequently asked questions about BMW 4 Series Convertible G23

Is servicing the same on every 4 Series Convertible G23 version?▾
No. The 4 Series Convertible G23 is available as petrol/diesel or hybrid depending on the version. The jobs differ by powertrain.
What are the common problems on the 4 Series Convertible G23?▾
4 Series Convertible G23 owners should especially watch: Fabric roof weatherstripping and drains: inspect rear drainage channels and lubricate rubber seals annually. Plastic cooling pipe connectors: check cylinder head coolant vent line for weeping or brittleness. Garajo includes these watch points so you can act early.
How much does it cost to service a BMW 4 Series Convertible G23?▾
The service budget for a BMW 4 Series Convertible G23 sits about 68% 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 4 Series Convertible G23 powertrain is best for town use?▾
BMW 4 Series Convertible G23 mix: petrol/diesel : 4 versions ; hybrid : 14 versions. In town, prefer hybrid versions; they stay more efficient in frequent stop-start traffic. The range is mostly hybrid (14 of 18).
Which BMW 4 Series Convertible G23 powertrain should you choose if you mostly drive on the motorway?▾
BMW 4 Series Convertible G23 mix: petrol/diesel : 4 versions ; hybrid : 14 versions. On the motorway, prefer petrol/diesel versions with the best power-to-consumption compromise. The range is mostly hybrid (14 of 18).

Compatible engine oil

Which engine oil for BMW 4 Series Convertible G23?

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

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