Mazda CX-30 I (DM) (2019 – 2025)

Reliability score : 8.6/10

The Mazda CX-30 (DM generation) is a compact SUV positioned between the aging CX-3 and the family-oriented CX-5. Based on the Mazda 3 (BP) platform, it stands out with its very fluid 'Kodo' design, an interior finish bordering on the premium segment, and dynamic road handling. Although European demand has massively shifted towards mild-hybrid gasoline engines (e-Skyactiv G and the revolutionary e-Skyactiv X), the CX-30 was launched with a 1.8 Skyactiv-D diesel engine. This block, designed to meet Euro 6d-Temp standards without resorting to SCR (AdBlue) after-treatment thanks to a very low compression ratio, had a short career in Europe (withdrawn at the end of 2021) but remains relevant in the used car market for high-mileage drivers, and continues to be sold in other markets (Japan, Ocean

✅ Strengths

Very high-quality interior finish (materials, assembly)
Ergonomics of controls (intuitive central dial, no all-touchscreen)
Excellent sound insulation for the category
Dynamic road handling and precise steering
Overall reliability of naturally aspirated gasoline engines (Skyactiv-G)
Smooth and very reliable torque converter automatic gearbox (BVA6)

⚠️ Weaknesses

Rear passenger space and trunk volume (430 L) are average for its size (4.39 m)
Peripheral visibility (very thick C-pillars, narrow rear window)
1.8 diesel engine unsuitable for short trips (rapid clogging)
High maintenance cost for the e-Skyactiv X engine (spark plugs)
Infotainment system sometimes slow to start on early model years

🎯 Verdict

The Mazda CX-30 is one of the most reliable and best-finished compact SUVs of its generation. If you are specifically targeting the 1.8 Skyactiv-D Diesel engine, the purchase is conditional on your driving profile: it is excellent and frugal for high-mileage drivers covering many kilometers on roads and highways. However, if your usage includes city driving or short trips (< 20 km), AVOID the diesel to prevent chronic DPF, EGR valve, and oil dilution problems. In this case, opt for the excellent 2.0 e-Skyactiv G (or the 2.5 depending on your market), which offers almost irreproachable reliability and complete peace of mind.

Common issues

Encrassement du filtre à particules (FAP/DPF) Medium

🔧 80 000 – 150 000 km

💶 200 – 500 € (nettoyage) ; 1 000 – 2 500 € (remplacement)

Privilégier les longs trajets réguliers pour une bonne régénération du FAP.

Dysfonctionnement ou encrassement de la vanne EGR Medium

🔧 70 000 – 130 000 km

💶 150 – 300 € (nettoyage) ; 400 – 800 € (remplacement)

Faire vérifier et nettoyer préventivement si usage urbain fréquent.

Problèmes liés au système AdBlue (SCR) High

🔧 50 000 – 120 000 km

💶 400 – 800 € (capteur NOx) ; 800 – 1 500 € (pompe AdBlue)

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

Estimated maintenance costs

Oil change	£70 – 130
Timing chain	£1 000 – 2 000 (si nécessaire, non routinier)
Clutch	£750 – 1 400
Complete brakes	£220 – 480
Estimated annual budget	£550 – 1 100

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