2021 Mercedes-Benz GLC 300 AMG Line Prem DE 4M A 1.9L Electric diesel · JO09 GAT

Recurring tyre wear patterns on the rear axle define the mechanical history of this vehicle, which successfully passed its most recent MOT inspection on 10 September 2025 with no recorded defects. While the current status is clean, the previous test in October 2024 identified both nearside and offside rear tyres as being worn close to the legal limit with evidence of edge wear. This indicates a potential sensitivity in the rear axle geometry or alignment that warrants scrutiny, as consistent edge wear can often point to underlying issues with suspension settings rather than simple tread depletion. Accumulating 44,852 miles over a five-year period equates to an average annual usage of approximately 8,970 miles, a figure that sits well within the expected range for a vehicle of this class. This steady rate of mileage suggests the car has been in regular operation rather than subjected to long periods of inactivity, which typically helps mitigate the risks associated with seized components or perished seals. However, at this mileage threshold, the vehicle is entering a phase where high-wear consumables and suspension bushings begin to show their first signs of fatigue, making the consistency of its usage a neutral factor rather than a guarantee of component longevity. Given the history of rear tyre edge wear, your primary focus during a test drive should be the stability and tracking of the rear suspension. Listen closely for any rhythmic thumping or knocking sounds when traversing uneven road surfaces, as these are common indicators of worn trailing arm bushes or degraded shock absorber mounts. During the drive, ensure the vehicle tracks straight on a flat road surface without any pulling to the left or right, and observe whether the steering wheel remains perfectly centred. Any deviation or a feeling of vagueness in the rear end during cornering could suggest that the alignment issues noted in the 2024 test have persisted or that the suspension geometry requires professional calibration. Beyond the suspension, the braking system should be evaluated for any signs of uneven friction material wear, which can sometimes be exacerbated by the same alignment issues that affect tyre contact patches. Apply the brakes firmly from moderate speed in a safe area to check for any pulsing through the pedal or steering wheel, which could indicate warped discs or binding calipers. As this model features complex electronic systems and air suspension options, ensure the vehicle sits level when parked and that there are no warning lights illuminated on the dashboard during or after the test drive. Inspect the inner and outer sidewalls of the currently fitted tyres for any signs of uneven wear that would mirror the advisories from the previous year, as this will confirm whether the previous alignment concerns were rectified.