Summary

• With 109 currently listed for sale near Tucson, AZ and an average price of $19,944.00, 16.5% of 2018 Mercedes-Benz GLSs for sale on CarGurus are rated as good or great deals.

• Favorably reviewed: Owners rated the 2018 Mercedes-Benz GLS 4.8 / 5 stars.

• 65.1% of 2018 GLS models on CarGurus are accident free.

Why it stands out

The 2018 Mercedes-Benz GLS stands out as a large, luxury three-row SUV that emphasizes comfort, space, and a premium feel. It offers seating for six or seven people and up to 93.8 cubic feet of cargo space, while standard 4Matic all-wheel drive and Airmatic air suspension help give it the kind of composed ride expected from a Mercedes. For 2018, Mercedes-Benz also dropped the GLS350d from the lineup, leaving the GLS450 as the entry point and giving that model a new wheel design.

What makes the 2018 GLS especially distinctive is how much equipment it packed in, even by luxury-SUV standards. The GLS450 came with a 3.0-liter twin-turbo V6 making 362 horsepower and 369 lb-ft of torque, along with heated front seats, MB-Tex upholstery, a sunroof, power-folding third-row seats, an eight-inch touchscreen, and five years of mbrace Connect apps and remote connectivity. The GLS550 added a 4.7-liter twin-turbo V8 with 449 hp and 516 lb-ft of torque, plus features such as soft-close doors, three-zone climate control, front multicontour seats with cooling, navigation with real-time traffic and SiriusXM, Apple CarPlay, Android Auto, and a Harman/Kardon surround sound system. The AMG GLS63 pushed performance further with a hand-built 5.5-liter twin-turbo V8 producing 577 hp and 561 lb-ft of torque, along with AMG Performance all-wheel drive and Active Curve System for flatter cornering.

Even with its strengths, the 2018 GLS is not the most spacious or most modern-feeling option in Mercedes-Benz’s broader lineup, and its third-row access is a known drawback. Still, it appeals to buyers who want a full-size-feeling family SUV with genuine luxury touches, strong power, and a long list of standard and available features. Owners also tend to praise its comfort, performance, and electronic features, which reinforces the GLS’s appeal as a refined, well-equipped three-row SUV.

Other model years to consider

• 2024 Mercedes-Benz GLS

  • Average price: $67,373.00
  • Good/great deal percentage: 20.2%
  • User rating: 5 / 5
  • Total listings: 163

• 2025 Mercedes-Benz GLS

  • Average price: $79,310.00
  • Good/great deal percentage: 21.5%
  • Total listings: 158

This analysis is based on CarGurus' proprietary market data from August 6, 2026, CarGurus experts' opinions, and generative AI.