2018 Mercedes-Benz GLS 350 D AMG Line 4MATIC Auto 3.0L Diesel · GUI 500

The vehicle presents a stable roadworthiness profile following a successful MOT pass on February 18, 2026, at 89,460 miles. While the most recent test showed no defects, a failure just one month prior on January 22, 2026, at 89,070 miles warrants scrutiny. This recent failure suggests an administrative re-test or a minor component failure that was rectified immediately before the subsequent pass, rather than a chronic mechanical decline or structural degradation. The mileage accumulation remains consistent with typical usage for an eight-year-old SUV, averaging approximately 11,200 miles per annum. Between September 2022 at 59,217 miles and January 2024 at 74,186 miles, the vehicle covered 14,969 miles in just sixteen months. The more recent gap of 15,274 miles between the 2024 and early 2026 tests indicates a steady usage pattern, which generally helps prevent the seal degradation and brake corrosion associated with long periods of immobility. Because the MOT history is clean of recurring advisories regarding structural rust or the suspension system, a physical inspection should focus on high-wear components typical of this heavy AMG Line model. A buyer should verify the air suspension bellows for signs of leakage and inspect the brake discs for uneven wear or thinning. Given the recent failure in January 2026, it is vital to confirm what specific defect failed to ensure it was not a symptom of a deeper mechanical issue within the drivetrain or emissions system that has not yet resurfaced in a standard test.