Audi A8 D4 (4H) (2009 – 2017)

Reliability score : 7.4/10

The third-generation Audi A8 (D4, type 4H) represented the pinnacle of luxury and technological expertise from Ingolstadt upon its release. Built on the ASF (Audi Space Frame) aluminum structure, it stands out for its surprising agility for its size, its standard quattro AWD (except hybrid), and its exceptional interior finish. The late 2013 facelift (Model Year 2014) introduced the famous Matrix LED headlights, revised engines to meet the Euro 6 standard, and further improved soundproofing. Although its build quality is flawless, it is an extremely complex vehicle whose maintenance requires a substantial budget, particularly on the V8 petrol and W12 engines.

✅ Strengths

Unrivaled interior finish and material quality (Valcona leather, wood trim, aluminum) for its time
Dynamic road handling for the segment thanks to the aluminum chassis (ASF) and quattro
Exceptional soundproofing (especially with acoustic double glazing)
Smooth, responsive, and highly reliable 8-speed ZF automatic gearbox
Stratospheric performance of the S8 and S8 Plus versions

⚠️ Weaknesses

Maintenance, insurance, and repair costs worthy of a supercar
Critical design flaw on the 4.0 TFSI (turbo oil strainer)
Rapid wear of consumables (brakes, tires) due to the weight (nearly 2 tons)
Aging MMI infotainment system on pre-facelift models (2009-2013)
Fragile retractable mechanism of the central MMI screen (plastic gears that break)

🎯 Verdict

The Audi A8 D4 is a fascinating technological showcase that offers an exceptional price-to-performance ratio on the used market due to its heavy depreciation. However, this depreciation is justified by prohibitive maintenance costs. If you are looking for a petrol engine, the 3.0 TFSI is the most reasonable and reliable choice. The V8 versions (4.0 TFSI and S8) offer supercar performance but require absolute vigilance regarding the turbo recall (oil strainer), otherwise you risk bills exceeding €10,000. Buy only with a complete maintenance history from the dealer network or a recognized specialist, and keep a comfortable financial reserve for unforeseen events (air suspension, electronics).

Common issues

Défaillance du compresseur ou des amortisseurs de suspension pneumatique High

🔧 100 000 – 180 000 km

💶 800 – 2 000 € par élément (compresseur ou amortisseur)

Vérifier l'assiette du véhicule à l'arrêt et l'absence de bruits anormaux du compresseur.

Accumulation de calamine sur les soupapes d'admission (moteurs TFSI) Medium

🔧 80 000 – 150 000 km

💶 400 – 800 € (nettoyage par sablage)

Un nettoyage préventif peut restaurer performances et consommation.

Usure prématurée des tendeurs ou guides de chaîne de distribution (moteurs TFSI) High

🔧 120 000 – 200 000 km

💶 2 500 – 5 000 € (nécessite souvent la dépose moteur)

Écouter attentivement les bruits de cliquetis au démarrage à froid.

Fuites d'huile moteur (joints de cache-culbuteurs, carter, supports de filtre) Medium

🔧 100 000 – 180 000 km

💶 300 – 1 000 € (selon la localisation et l'accès)

Vérifier régulièrement le niveau d'huile et l'absence de taches sous le véhicule.

Estimated maintenance costs

Oil change	£100 – 180
Complete brakes	£650 – 1 200
Estimated annual budget	£800 – 1 600

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