2020 Mercedes-Benz GLC 300 AMG Line Prem D 4M A 1.9L Diesel · AV04 WBA

A clean and uninterrupted DVSA record defines this 2020 Mercedes-Benz GLC 300d AMG Line, with three consecutive passes at the 2023, 2024, and 2025 tests and zero advisories or failures logged on any of those occasions. The absence of corrosion advisories is particularly relevant for a GLC of this vintage, given that the Mopf facelift-era chassis can develop subframe and suspension arm corrosion in regions that use winter de-icing salt. The clean sheet also means there is no recorded MOT history of brake disc lipping, binding calipers, oil misting from the OM654 diesel engine, or any structural concerns through the tested components. A prospective buyer is therefore looking at a vehicle that has consistently presented as roadworthy under official inspection, with no trend of worsening defects. With around 57,928 miles recorded against a six-year age, the GLC is averaging roughly 9,650 miles per year, which sits comfortably within the expected band for a premium SUV used as a mixed commuter and leisure vehicle. The annual mileage progression implied between the 2023 and 2025 tests is steady rather than erratic, suggesting the vehicle has been in regular use rather than subjected to long stationary periods or sudden high-mileage bursts. Mechanically, this kind of consistent running is favourable for the 2.0-litre OM654 diesel, the 9G-Tronic automatic, and the 4MATIC drivetrain, as regular operation keeps the DPF in active regeneration cycles and prevents oil seals, turbo actuators, and AdBlue system components from seizing or crystallising. The current odometer reading also indicates that the timing chain, typically a watch item on higher-mileage OM654 units, is not yet in the most scrutinised wear zone, though it should still be verified. From a buyer standpoint, the absence of recorded advisories means a pre-purchase inspection should pivot towards the components the MOT does not cover, alongside a careful visual check for any defects that may be just below the test threshold. On a test drive, listen for any clonks or knocking from the front suspension over speed bumps and uneven surfaces, paying particular attention to the lower control arm bushes, anti-roll bar drop links, and the thrust arms, as these are common wear items on the GLC platform and would not necessarily fail an MOT until they show measurable play. Steering should feel precise with no vibration through the wheel at motorway speeds, and any pull to one side under braking would warrant close inspection of the front discs for lipping and the caliper carriers for stiffness. Under acceleration, the 9G-Tronic should deliver smooth, almost imperceptible shifts; any shunt, flare, or delayed engagement between gears would suggest mechatronic wear or low fluid level in the automatic gearbox. The diesel-specific items deserve particular attention given the mileage band. Check for any signs of oil weep around the OM654's front crankshaft seal and the turbocharger oil feed line, as these are known to mist at higher mileages. Listen on cold start for any chain rattle from the engine's right-hand side, and confirm that the AdBlue tank and SCR system are functioning correctly, as any stored fault codes relating to NOx sensors will become increasingly expensive to rectify. Inspect the underside for any fresh surface corrosion on the subframe, suspension arms, and brake pipes, especially if the vehicle has spent time in regions with heavy winter gritting, as the spotless MOT record could simply reflect borderline test results that the previous keeper chose to monitor. Finally, confirm full Mercedes-Benz service history, with particular focus on the most recent oil change, brake fluid renewal, and any diesel filter replacement, as adherence to these intervals will be the strongest indicator of how this GLC will perform once it moves beyond the warranty envelope.