BMW Série 3 G20 (2018 – 2025)

Reliability score : 8.5/10

The seventh-generation BMW 3 Series (G20 for the sedan, G21 for the Touring wagon, G28 for the long-wheelbase version in Asia) marks a return to its roots in driving dynamics compared to the previous F30. Based on the modular CLAR platform, it offers increased rigidity, top-notch sound insulation, and an interior finish that places it at the top of its class. The mid-2022 facelift (LCI) modernized the front end and revolutionized the interior with the integration of the large curved dual screen (BMW Curved Display) running iDrive 8. Diesel Focus: Although the market is shifting towards hybrids, the 3 Series G20 offers some of the best diesel engines in the world (B47 and B57 families). The introduction of 48V mild-hybrid (MHEV) technology in 2020 further optimized their refinement (imperce

✅ Strengths

Diesel engines (B47/B57) among the most accomplished, reliable, and fuel-efficient on the market
Exceptional road handling, perfect comfort/dynamism compromise
Significantly improved interior finish quality compared to the F30
Very refined sound insulation (acoustic glazing often present)
Magistral ZF 8-speed automatic gearbox (BVA8) on all versions

⚠️ Weaknesses

Average rear passenger space and trunk volume for its size (especially on PHEVs, which lose 105 liters)
Ergonomics of the all-touch interface on facelifted versions (LCI with iDrive 8)
Very high used car prices, numerous and expensive options
M Sport suspension sometimes too firm at low speeds on degraded roads

🎯 Verdict

The BMW 3 Series G20 is undoubtedly one of the best premium family sedans of its generation. If you are looking for a vehicle to cover long distances, the diesel versions (320d and 330d) are engineering masterpieces, offering an unbeatable performance/consumption ratio. Basic mechanical reliability is excellent, provided that the EGR cooler recall has been carried out. The gasoline versions (320i, 330i) and the fabulous M340i are equally recommendable. The plug-in hybrid versions (320e/330e) are fiscally relevant but require more vigilance regarding their electrical history.

Common issues

Vanne EGR et refroidisseur EGR encrassés/défectueux Medium

🔧 80 000 – 150 000 km

💶 600 – 1 200 €

Vérifier l'historique d'entretien, privilégier les longs trajets réguliers.

Filtre à particules (FAP/DPF) encrassé ou capteurs défectueux High

🔧 100 000 – 200 000 km

💶 1 500 – 3 000 €

Éviter les petits trajets urbains, surveiller les cycles de régénération.

Dysfonctionnement du système AdBlue (SCR) : capteurs, pompe ou cristallisation Medium

🔧 80 000 – 180 000 km

💶 500 – 1 800 €

Utiliser un AdBlue de qualité, éviter de rouler avec un réservoir vide.

Problèmes logiciels ou électroniques (iDrive, capteurs divers) Low

🔧 Variable, souvent dès 30 000 km

💶 100 – 600 €

S'assurer que toutes les mises à jour logicielles ont été effectuées.

Estimated maintenance costs

Oil change	£70 – 130
Complete brakes	£220 – 480
Estimated annual budget	£550 – 1 100

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