The Mercedes-Benz GLS (X166 generation) is the extensive facelift of the GL. Renamed to emphasize its positioning as the "S-Class of SUVs", it is a luxurious 7-seater off-roader offering gigantic interior space and exceptional ride comfort thanks to its standard AIRMATIC air suspension. Although the cabin is starting to show its age compared to current standards (older generation COMAND infotainment system), it remains a formidable long-distance cruiser. The diesel engine (350 d) accounts for the overwhelming majority of sales in Europe, offering the best compromise between torque (620 Nm) and fuel consumption to move its 2.4 tons.
The Mercedes GLS X166 is a formidable tool for hitting the road with the family in absolute comfort. The 350 d (OM642) version is by far the most rational and common choice. Although this diesel V6 is inherently robust, it requires meticulous maintenance and highway use to avoid clogging. Avoid examples that have been driven exclusively in the city. Anticipate a substantial maintenance budget, particularly for the running gear (tires, brakes) and the air suspension, which will inevitably require expenses. The V8 petrol versions (500/63 AMG) are to be avoided without a solid warranty due to the documented fragility of their cylinders.