2019 Mercedes-Benz GLC 2.1L Diesel · RF68 OGC

A recurring theme of front suspension ball joint wear and premature tyre deterioration defines the roadworthiness profile of this 2019 Mercedes-Benz GLC. The nearside front lower suspension arm ball joint has now appeared across two consecutive annual tests, first recorded with slight play in January 2023 and progressing to an excessively worn state at the January 2025 test, where it was the cause of a Major failure. The vehicle also attracted a tyre-related Major failure at the same January 2025 test due to deep cuts exposing ply or cords on both front tyres, and another Dangerous failure at the most recent January 2026 test for a nearside rear tyre measuring below the legal 1.6mm tread threshold, accompanied by an advisory for the offside rear tyre worn down to 2mm. The advisory issued at the January 2025 test flagging possible incorrect sized wheels and tyres, combined with the recurring tyre damage and accelerated wear, suggests the rolling stock may not be the correct specification for the vehicle, which would have implications for both safety and rolling circumference readings. The vehicle did pass the most recent test on 16 January 2026 with no defects recorded, but the concentrated cluster of advisories and failures spanning 2022 through early 2026 indicates a component wear pattern that warrants close mechanical scrutiny before purchase. With 47,171 recorded miles accumulated across approximately seven years, the GLC averages around 6,739 miles annually, which sits within typical usage parameters for a vehicle of this age and segment. The MOT testing history is continuous on an annual cycle with no extended gaps in testing, suggesting the vehicle has remained in regular road use rather than being laid up for prolonged periods. At this mileage level, wear on consumable items such as brake pads, discs, tyres, and suspension bushes is to be expected, and the recorded advisories are broadly consistent with what a Mercedes-Benz GLC of this age and mileage would typically present. The mileage progression between tests appears steady without any abrupt anomalies, indicating consistent usage patterns throughout the recorded period. For a prospective buyer, the nearside front lower suspension arm ball joint is the primary mechanical concern given its documented progression from slight play in 2023 to an MOT failure category defect by 2025. On a test drive, listen for clonks or knocking from the front suspension when traversing speed bumps, uneven road surfaces, or during sharp low-speed direction changes, and feel for any vagueness or delay in steering response that could indicate the joint has further deteriorated since the last test. Inspect the front tyres carefully for uneven shoulder wear, sidewall damage, or cuts reaching the cords, as the 2022 failure specifically noted both front tyres suffering cuts deep enough to reach the ply, which is consistent with either incorrect wheel alignment, kerb impact damage, or fitment of an undersized tyre profile. Confirm with the seller that the wheels and tyres conform to Mercedes-Benz specification, as the persistent advisory on this point raises the possibility that non-standard fitments have been used. Given the Dangerous failure for sub-1.6mm tread depth on the nearside rear tyre at the January 2026 test, all four tyres should be physically inspected for remaining tread depth using a calibrated gauge, with particular attention to the inner shoulders where wear is often hidden. The advisory noting slight perishing on both rear tyres from January 2024 should also prompt a close visual examination of the sidewalls for any age-related cracking, which on a 2019-vintage vehicle would not yet be expected on correctly stored tyres but may be accelerated by prolonged UV exposure or extended periods of low pressure. Under the vehicle, examine the front lower suspension arms and ball joints for any grease leakage from the ball joint boot, physical play when the wheel is rocked by hand at the three and nine o'clock positions, or any signs of fresh component replacement that could indicate the issue was only recently addressed rather than resolved at the source. Finally, request documentation confirming whether the suspension arm and ball joint were replaced following the January 2025 Major failure, as the absence of any subsequent advisory on this component in the 2026 test suggests remedial work was carried out, but the buyer should verify the quality and provenance of that repair directly.