Mercedes GLS X167 (2019 – 2025)

Reliability score : 7.8/10

Mercedes-Benz GLS (X167 Generation) Often called the « S-Class of SUVs », the Mercedes-Benz GLS (X167) is the flagship of the star-badged manufacturer's SUV range. Launched in 2019 to counter the BMW X7, it offers superlative luxury, generous space with 7 true seats, and an impressive technological arsenal (MBUX system, optional E-Active Body Control suspension). A restyling (facelift) occurred in 2023, bringing minor aesthetic touches, an MBUX system update, and generalized mild hybridization (48V) to all powertrains, including diesels. Although majestic and extremely comfortable, this behemoth weighing over 2.5 tons incorporates complex electronics. The 48V onboard network, essential for the operation of micro-hybrid powertrains and active suspensions, is the Achilles' heel of this gener

✅ Strengths

Exceptional OM656 diesel engine: torquey, economical, and very mechanically reliable
Imperial ride comfort (especially with wheels < 22 inches)
Gigantic interior space and 7 true seats usable by adults
Soundproofing worthy of an S-Class
Towing capacity (up to 3.5 tons)

Common issues

Dysfonctionnement du système AdBlue (SCR) Medium

🔧 50 000 – 120 000 km

💶 800 – 2 000 €

Utiliser AdBlue de qualité, éviter les faibles niveaux, faire des trajets longs.

Problèmes logiciels MBUX / Infotainment Low

🔧 Dès les premiers kilomètres

💶 150 – 300 € (diagnostic, hors garantie)

S'assurer des mises à jour logicielles régulières du système.

Fuites ou défaillances de la suspension pneumatique (AIRMATIC) High

🔧 80 000 – 150 000 km

💶 1 500 – 3 500 € (par essieu ou compresseur)

Vérifier l'assiette du véhicule à l'arrêt, écouter le compresseur.

Encrassement du filtre à particules diesel (FAP/DPF) Medium

🔧 60 000 – 150 000 km

💶 300 – 800 € (nettoyage) ; 1 500 – 3 000 € (remplacement)

Effectuer régulièrement des trajets autoroutiers pour régénération.

Estimated maintenance costs

Oil change	£160 – 280
Complete brakes	£650 – 1 200
Estimated annual budget	£1 000 – 2 000

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