Mazda MX-5 III (NC) (2005 – 2015)

Reliability score : 8.6/10

The third-generation Mazda MX-5 (code name NC) marks a major evolution for the famous roadster. Based on a modified Mazda RX-8 platform, it is wider, stiffer, and safer than the previous generation (NB), while retaining the Jinba Ittai philosophy (the oneness of horse and rider). It went through three distinct phases: - NC1 (2005-2008): Initial launch. - NC2 (2008-2012): Major facelift (more aggressive front end, smiling grille), significant mechanical improvements to the 2.0L engine (forged internals, rev limiter pushed to 7500 rpm) and revised gearbox synchronizers. - NC3 (2012-2015): Minor aesthetic facelift, integration of an active hood for pedestrian safety, and accelerator reprogramming. A notable fact: it was the first MX-5 to offer, starting in 2006, an electrically retractable ha

✅ Strengths

Exceptional overall mechanical reliability (very durable chain-driven MZR engines)
Exemplary road handling (50/50 weight distribution, rear-wheel drive)
Choice between traditional soft top and very reliable retractable hardtop (PRHT)
Very reasonable maintenance costs and spare parts
Excellent driving position and driver-focused ergonomics
Very relevant mechanical improvements on phase 2 (NC2)

⚠️ Weaknesses

Susceptibility to corrosion (a common issue for Mazdas of this era: underbody, frame rails, wheel arches)
Fragile coolant expansion tank (major design flaw that can lead to engine failure)
Soft top water drains that clog easily, flooding the cabin
Highway sound insulation (especially with the soft top version)
Hard interior plastics that scratch easily
Illegible oil dipstick, sometimes leading to low oil levels due to owner oversight

🎯 Verdict

The Mazda MX-5 NC is a fantastic roadster, offering an almost unbeatable price/pleasure/reliability ratio on the used car market. The 2.0L engine, particularly from the NC2 facelift (2008+) onwards, is the preferred choice for driving enthusiasts thanks to its reinforced internals and more spirited character. However, two major drawbacks require absolute vigilance before purchase: underbody corrosion (which can quickly become very expensive in bodywork) and the coolant expansion tank (to be preventively replaced for about fifty euros to avoid fatal engine failure). Prioritize a healthy example, ideally treated against rust (Dinitrol/Waxoyl), with a clear maintenance history.

Common issues

Bouchage des drains de capote entraînant infiltration d'eau Medium

🔧 Variable, souvent après 5 ans ou 50 000 km

💶 50 – 200 € (nettoyage) ; 200 – 800 € (si dégâts électriques)

Nettoyer régulièrement les drains pour éviter les infiltrations et problèmes électriques.

Usure prématurée des amortisseurs et silentblocs de suspension Medium

🔧 80 000 – 120 000 km

💶 400 – 1 000 € (amortisseurs) ; 300 – 700 € (silentblocs)

Vérifier le comportement routier et l'état des amortisseurs lors de l'essai.

Défaillance du cylindre émetteur ou récepteur d'embrayage Medium

🔧 100 000 – 150 000 km

💶 250 – 500 €

Tester la souplesse de la pédale d'embrayage et l'absence de fuites.

Estimated maintenance costs

Oil change	£70 – 130
Clutch	£750 – 1 400
Complete brakes	£220 – 480
Estimated annual budget	£500 – 1 000

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