A 2009 Mercedes-Benz GL 320 presenting a fully clean MOT history with no recorded advisories or component defects across every test entry, the most recent being a pass on 2 June 2025. Across five documented tests between September 2022 and June 2025, the vehicle has accumulated zero flagged items relating to corrosion, suspension wear, braking condition, exhaust integrity, or any other testable category. One entry on 20 September 2023 shows a fail recorded on the same date as a pass, indicating a straightforward pass-after-fail retest sequence rather than any structural concern, as no defects were logged against either result. For a 17-year-old premium SUV of this size and weight, a record entirely free of advisories is uncommon and reflects either prompt rectification of wear items between tests or genuinely minimal component degradation under normal use. Overall, the trend is one of consistent roadworthiness with no mechanical pattern visible to a prospective buyer.
Mileage on this GL 320 stands at 93,318 recorded miles, which equates to an average of roughly 5,489 miles per year over its 17-year life, placing it firmly in the lower-accumulation bracket for its age and segment. This figure is notably below the typical annual mileage for a large family SUV, which often runs in the 8,000 to 12,000 mile range, and suggests either a secondary-vehicle usage pattern, predominantly short urban journeys, or extended periods of inactivity between tests. The gap between the September 2022 test and the September 2023 test shows a relatively short annual interval, while the progression to mid-2024 and mid-2025 follows a roughly twelve-month cadence, indicating the vehicle has been in regular use over the past three years rather than laid up. Mechanically, lower annual mileage on a diesel-powered vehicle of this vintage reduces wear on high-mileage components such as the drivetrain and injectors, but it can also accelerate issues associated with short journeys and infrequent operation, including moisture accumulation in the exhaust system, glazing of brake discs and pads from light use, and potential degradation of rubber suspension bushes that suffer from underloading rather than wear.
Despite the clean MOT record, a prospective buyer should approach this GL 320 with awareness of the components most commonly affected on a large, heavy Mercedes-Benz SUV of this generation, particularly the air suspension system, which is a known maintenance item on these vehicles regardless of MOT coverage. On a test drive, listen carefully for any suspension hesitation, sagging at the rear when stationary, or the compressor running excessively after startup, as the MOT test does not assess the active function of the air spring system in detail. Inspect the underside for any signs of fluid weeping from the front axle assemblies, transfer case, or AdBlue-related components, as diesel emissions systems on these models can develop faults that would not necessarily be flagged in the basic MOT categories. Test the automatic transmission by performing multiple smooth gear changes under moderate acceleration, listening for any shunt or delay, and verify that the 4MATIC system engages correctly by driving in a tight circle on a loose surface to detect any binding or vibration from the centre coupling.
Brake feel should be evaluated by performing a series of firm stops from around 30 mph, paying particular attention to pedal travel, any pulling to one side, or vibration through the steering wheel which could indicate warped front discs from heat cycling under the vehicle's substantial kerb weight. On the test drive, listen for clonks or knocks over uneven surfaces, particularly from the front suspension, as lower-mileage vehicles that have spent time stationary can develop play in anti-roll bar drop links and track rod ends without this being evident at MOT test speeds. Inspect all visible bodywork and undertray panels for rust, particularly around the wheel arches, lower tailgate, and front subframe mounting points, as chassis corrosion is one of the primary reasons older SUVs of this size fail their MOT. Finally, request evidence of recent servicing, with particular emphasis on the diesel fuel filter, oil filter housing, and any turbocharger-related work, as these are common maintenance items on a 17-year-old diesel GL that would not be visible in the MOT history but are essential to confirming the vehicle's ongoing mechanical integrity.