BMW Série 3 G20 (2018 – 2025)

Reliability score : 8.8/10

The BMW 3 Series G20 (sedan) and G21 (Touring) marks a return to its roots for the Bavarian brand, with an emphasis on driving dynamics that had been slightly dulled in the previous generation (F30). Based on the CLAR modular platform, it offers increased rigidity, more precise steering, and top-notch sound insulation. The facelift (LCI) that occurred mid-2022 modernized the interior with the integration of the large curved display (BMW Curved Display) under iDrive 8, while refining the light signature. In terms of reliability, the G20 is an excellent performer: it benefits from the maturity of the 'B' series modular engines (B48 for gasoline, B58 for 6-cylinder, B47/B57 for diesel), which have corrected the serious flaws of their predecessors (N20/N47). It is currently one of the most rel

✅ Strengths

Excellent overall reliability, particularly for B48 and B58 gasoline engines
Driving pleasure at the top of the category (chassis, steering, RWD)
Perfectly calibrated ZF 8-speed automatic gearbox
Significantly improved finish and assembly quality compared to the F30
Very responsive and ergonomic iDrive infotainment system

⚠️ Weaknesses

Firm damping, especially with M Sport suspension and wheels > 18 inches
Average rear passenger space and trunk volume for its size (especially on PHEVs)
Very high used prices and option costs
Early electronic bugs on initial models (2019-2020)
Recurring recalls on the EGR system of diesel versions

🎯 Verdict

The BMW 3 Series G20 is undoubtedly one of the best premium family cars of its decade. By turning its back on the reliability issues of the 2007-2015 period (N47 timing chains, N43/N53 coils/injectors), BMW designed extremely robust powertrains with the 'B' generation of engines. The gasoline versions (320i, 330i and especially the incredible M340i) are to be favored: they offer superior driving pleasure, top-notch reliability, and avoid the complex emissions control problems of diesels (EGR). Purchase is highly recommended, provided you choose a model with a clear history and, if possible, opt for more frequent oil changes (15,000 km) to maximize longevity.

Common issues

Problèmes logiciels iDrive/infodivertissement (écrans noirs, redémarrages, bugs de connectivité) Low

🔧 Dès l'achat – 80 000 km

💶 0 – 1 500 € (mise à jour logicielle ou remplacement de module)

Vérifier l'historique des mises à jour logicielles et tester toutes les fonctions.

Fuites d'huile mineures (joint de cache-culbuteurs, support de filtre à huile) Medium

🔧 80 000 – 150 000 km

💶 300 – 800 €

Inspecter régulièrement le moteur pour toute trace d'huile, surtout sous le véhicule.

Usure prématurée de certains composants de suspension (silentblocs, biellettes) Medium

🔧 60 000 – 120 000 km

💶 200 – 600 € par essieu

Tester la voiture sur route dégradée, écouter les bruits de suspension.

Dysfonctionnements de capteurs électroniques (ex: capteurs de stationnement, capteurs ABS/roue) Low

🔧 40 000 – 100 000 km

💶 150 – 400 € par capteur

S'assurer que tous les systèmes électroniques fonctionnent sans message d'erreur.

Estimated maintenance costs

Oil change	£130 – 220
Complete brakes	£500 – 1 000
Estimated annual budget	£650 – 1 300

Indicative estimates (independent garage, UK market). Prices vary by region and year.