2021 Mercedes-Benz GLC 1.9L Diesel · AY21 OSM

The GLC presents a mixed mechanical picture. The most recent test on 11 April 2025 at 107,113 miles resulted in a pass, but the record reveals a clear pattern of deferred maintenance rather than proactive servicing. Just over two weeks earlier, on 25 March 2025, the same vehicle failed at the identical recorded mileage of 107,113 miles. The tester flagged a windscreen damaged sufficiently to affect the driver's view, both front wiper blades defective, front brake discs worn, slight play in the offside front lower suspension arm ball joint, and cuts penetrating to the ply or cords in both front tyres. The subsequent pass indicates these specific items were addressed, yet the underlying trend is concerning. The vehicle failed on brake disc wear and inner pad wear at 79,264 miles in March 2024, then passed cleanly on the retest the same day. This cycle of borderline failures followed by last-minute corrections suggests a reactive maintenance approach rather than scheduled servicing. The mileage pattern raises significant questions. Between the clean pass on 28 March 2024 at 79,266 miles and the March 2025 failure at 107,113 miles, the vehicle accumulated 27,847 miles in approximately twelve months. That equates to roughly 2,320 miles per month, substantially higher than the overall average of 21,423 miles per year. The recorded mileage remained static at 107,113 miles across both the March 2025 failure and the April 2025 pass, which is unusual for a vehicle in active daily use. This plateau could indicate a period of limited use, a recent import reading discrepancy, or a data recording anomaly. A buyer should verify the true mileage through service invoices, previous MOT certificates, and the digital service record to rule out any odometer discrepancy. The recurring advisories and failures point to specific components demanding close physical inspection. The offside front lower suspension arm ball joint showed slight play in both the March 2025 failure and the April 2025 pass, suggesting the issue was noted but not necessarily rectified. A worn ball joint at this mileage on a GLC is premature and may indicate aggressive driving over speed restrictions or poor road conditions. The front brake discs were flagged as worn in March 2025, and the March 2024 failure involved both front and rear discs worn, pitted, or scored alongside worn pads. This repeated brake wear pattern at relatively low intervals indicates either aggressive driving habits or a lack of routine brake fluid changes leading to caliper seizure or pad drag. The tester should inspect the front suspension arm ball joint for play, check the condition of the front brake discs and pads for uneven wear, and examine the rear calipers for binding. The tyre condition across both 2025 tests is particularly telling. Cuts reaching the ply or cords on both front tyres in March 2025, alongside cuts on both rear tyres, suggest the vehicle has been driven over kerbs, potholes, or road debris repeatedly. The fuel flap remaining broken but secure across both tests indicates a minor but persistent fault left unrepaired. A prospective buyer should thoroughly inspect all four tyre sidewalls for fresh cuts or bulging, check the windscreen replacement quality for optical distortion, and test the parking brake function given the history of rear brake disc wear. The suspension bushes, coil springs, and anti-roll bar links should be examined for wear, as the ball joint play suggests the front end has not been maintained to expected standards for a vehicle of this type and value.