The 2025 GLS 450 d AMG Line Premium Plus is the flagship diesel-powered luxury SUV in the GLS range. It combines a powerful 3.0-litre inline-6 diesel mild-hybrid engine with premium comfort, advanced technology, and genuine 7-seat practicality. It sits below the high-performance AMG GLS 63, but still features AMG Line styling, air suspension, luxury interior appointments, and extensive driver assistance systems. The "Premium Plus" specification is one of the highest trims available in the UK market.