2016 Mercedes-Benz GL 3.0L Diesel · AB58 LEW

A pattern of front brake wear, tyre deterioration, and lighting defects has defined this Mercedes-Benz GL's recent MOT history, with two failures recorded in the last three tests alongside a cluster of advisories that hint at the mechanical priorities a buyer should focus on. The most recent test on 2026-06-18 returned a pass, but only after a failure the day before for a non-functioning nearside door mirror repeater and headlamp aim issues on both sides, items that were clearly rectified between the two visits. The earlier failure on 2024-06-13 is more concerning from a mechanical standpoint, citing a missing nearside front road wheel fixing and a front brake disc recorded as significantly and obviously worn, alongside advisories on all four tyres for being worn close to the legal limit. Taken together, the trend suggests an otherwise roadworthy vehicle that has needed attention to consumables and lighting alignment, rather than a structural or corrosion problem, though the brake binding advisory now appearing on both of the latest tests indicates a caliper or handbrake mechanism issue that warrants monitoring. The recorded mileage of 77,490 miles against an age of roughly ten years equates to an annual accumulation of around 7,700 miles, which is broadly typical for a large luxury SUV of this era and points to steady use rather than long periods of standing or unusually high motorway mileage. There are no significant gaps in the testing timeline, with annual MOTs recorded consistently from 2021 onwards, which means the wear patterns visible in the records are unlikely to be distorted by extended lay-ups that could cause issues with seized calipers, perished rubber, or brake component corrosion. The 2024 advisories flagging all four tyres worn close to the legal limit on the same test is consistent with a vehicle that has covered meaningful mileage between visits, and a buyer should expect that tyres, brake pads, and discs on a GL of this size and weight will continue to demand attention as mileage accrues. For a prospective buyer, the priority areas on inspection are the front braking system and the rear offside caliper. The 2024 failure for a significantly worn front brake disc and the subsequent advisory on the offside rear service brake binding suggest that any test drive should include several firm stops from moderate speed, listening for grinding, scraping, or pulsing through the pedal, and the car should be observed from behind after a short drive to confirm the offside rear wheel rotates freely without heat haze or visible drag. A cooling system check is also warranted given the 2025 advisory for a coolant leak, which on the M-Class and GL platform commonly traces to the coolant rail behind the intake manifold or the thermostat housing; the engine bay should be inspected for crusty residue around the V6 or V8 coolant junctions and the coolant reservoir checked for any signs of pressure loss after a warm run. Headlamp alignment should be re-verified after any replacement of suspension components, as the 2026 failure for both headlamp aim defects indicates that the adjusters were not centred at the time of test. Further checks on a test drive should focus on the suspension and steering, as a GL of this age and mileage is susceptible to worn front lower control arms, thrust arms, and anti-roll bar drop links, all of which can produce clonking noises over speed humps or a vague, wandering feel in the steering. The nearside front road wheel fixing recorded as missing in 2024 should be confirmed as properly torqued on any vehicle viewed, as a single missing stud on a heavy SUV is a serious safety concern. Finally, the front wiper smearing advisory repeated across the 2026 tests is a minor but useful indicator of wiper blade condition, and a buyer should ensure both front wipers clear the screen cleanly without chatter or unwiped arcs, particularly given the GL's large windscreen area which can compromise visibility in poor weather if the blades are degraded.