2017 Mercedes-Benz GLC 3.0L Diesel · DF67 DWC

The most recent MOT test on 2026-03-02 resulted in a clean pass, indicating that the vehicle has maintained its roadworthiness without any critical failures or major defects during this period. However, the preceding MOT history reveals a pattern of recurring advisories rather than outright failures, suggesting that while the car is not currently unsafe, there are developing issues that warrant attention. The advisories from 2024-11-25—particularly the worn, pitted, or scored rear brake discs and the corroded but not seriously weakened offside front Macpherson strut—highlight wear progression that, if left unaddressed, could escalate into more serious mechanical or safety concerns. The absence of failures in the intervening years suggests that maintenance has been consistent, but the presence of these advisories indicates that the vehicle has experienced gradual degradation in key components, particularly in braking and suspension systems. The recorded mileage of 70,166 miles for a 2017 GLC represents a reasonable annual usage rate of approximately 7,796 miles per year, which aligns with typical driving patterns for this age group. This level of mileage is not excessively high for a nine-year-old vehicle, but it does imply that the car has undergone regular use, particularly in the last three years, where mileage accumulation appears more pronounced. Lower mileage in earlier years could reflect periods of storage or lighter use, but the consistent wear advisories suggest that the vehicle has been subjected to moderate to heavy operational stress, accelerating wear on components like brake discs and suspension elements. The absence of significant mileage gaps does not necessarily indicate neglect, but it does mean that consumables such as brake pads, suspension seals, and fluids may have reached or neared their service thresholds sooner than a lower-mileage vehicle might. For a prospective buyer, this GLC presents a case where a thorough pre-purchase inspection is essential to confirm the advisories recorded in the MOT history and to assess their severity. Focus on the rear brake system first, as the pitted or scored discs may indicate uneven wear or potential brake fluid contamination, which could lead to reduced braking efficiency or even failure if not serviced. Listen for a grinding noise when applying the rear brakes, which could signal metal-to-metal contact between the discs and pads, and check for uneven brake pad thickness or warping. During a test drive, monitor for a soft or spongy brake pedal, which might suggest air in the system or hydraulic fluid degradation. The corroded Macpherson strut should be inspected for any signs of excessive play or binding, as this could lead to steering instability or suspension failure. Pay particular attention to the offside front wheel, as the strut’s condition may affect alignment and handling. In addition to the mechanical checks above, address practical concerns such as tyre condition. The advisories from 2021 and 2020 regarding tyre cracking or perishing on both near and offside front tyres indicate that the rubber may be approaching its useful lifespan, particularly if the vehicle has been stored for extended periods without use. Inspect the tyre sidewalls for signs of dry rot, delamination, or cracks, as these can compromise tyre integrity and increase the risk of sudden failure. Check the tyre tread depth, ensuring it meets the legal minimum of 1.6mm across the central ¾ of the tread, and verify that the tread pattern is not excessively worn or glazed. Given the vehicle’s age and the advisories present, a full fluid service is advisable, including the brake fluid, differential fluid, and transmission fluid, as these fluids degrade over time even when not used. Ensure the 12V battery is in good condition, as prolonged periods of disuse can lead to sulphation or weak terminals, which may require a deep discharge or replacement. Finally, verify that the service book is up to date, particularly for the suspension and brake components, as the advisories suggest that routine maintenance may have been overlooked in the past.