2018 Mercedes-Benz GLC 2.1L Diesel · C20 LAE

A six-year MOT testing sequence for this Mercedes-Benz GLC demonstrates a broadly stable roadworthiness profile punctuated by a single recorded failure and a cluster of front-axle advisories in 2024. Four of the six tests returned clean passes with no defects recorded, including the most recent examination on 9 May 2025 and the earlier tests in 2021, 2022 and 2023. The disruption to that pattern came in May 2024, when a dangerous nearside front tyre tread depth defect caused an outright failure on 13 May, followed by a retest eight days later that passed with advisories remaining on the front tyres and both front brake discs. Since that episode, the vehicle has returned to a clean test outcome, though the front-end components flagged in 2024 warrant continued scrutiny given the pattern of wear recorded. Mileage progression across the testing history suggests fairly steady annual use, with 76,163 miles accumulated over roughly eight years at an average of around 9,500 miles per year, a figure broadly consistent with typical usage for a vehicle of this age and class. There are no extended gaps between test dates that would suggest long periods off the road, and the absence of multi-year lay-ups means corrosion-related advisories are less likely to be a primary concern, though localised surface corrosion on underbody components should still be inspected. At this mileage, wear on consumable items such as suspension bushes, brake pads, discs and tyres should be regarded as expected, and the brake disc advisories already on record are a reasonable indicator that further disc or pad attention may be approaching. For a prospective buyer, the front axle is clearly the area requiring the most attentive inspection. The 2024 record flagged both front brake discs as pitted or scored, and while these were not classed as seriously weakened at the time, pitted discs on a vehicle now approaching 80,000 miles may have progressed towards needing replacement, often visible as a raised lip on the disc edge, vibration through the steering wheel under braking, or a grinding or squealing noise. The nearside front tyre was found to be below the legal 1.6mm tread limit at the May 2024 failure, and although the most recent test recorded no defects, an uneven wear pattern across the front pair, particularly inner-edge wear, can point to suspension geometry issues such as worn wishbone bushes, track rod ends or drop links, all of which are common failure items on a GLC of this age and mileage. The 2024 advisory concerning the nearside front drive shaft CV boot is another item that deserves a specific check on any test drive, as a split boot will eventually allow grease loss and contamination of the joint, leading to vibration under acceleration or a clicking noise on full lock. On a road test, listen for any knocking from the front suspension over uneven surfaces, clunks during slow-speed direction changes, or a juddering sensation through the brake pedal which would suggest the pitted discs have worsened. Steering should remain precise with no pulling to either side, and the transmission should engage smoothly without shudders. Inspecting the underbody for any fresh oil weeping from the engine or differential seals, along with a thorough check of the front brake disc condition by feel through the wheel, will round out the assessment of this otherwise consistent MOT record.