2020 Mercedes-Benz GLC 300 AMG Line Prem + D 4M A 1.9L Diesel · EC10 CAM

The latest MOT test conducted on 2026-02-03 resulted in a passing outcome, though it included two advisories that warrant careful attention. The presence of thin front brake pads and a worn, pitted, or scored front brake disc—though not deemed seriously weakened—indicates that the braking system is approaching its operational limits and requires proactive maintenance. Comparing this to the previous MOT records, the trend remains stable, with no failures or worsening conditions detected in the intervening years. However, the advisories from the most recent test suggest that the wear on these components has progressed since the last inspection, meaning that further monitoring and potential replacement will be necessary to prevent reduced braking performance or premature failure. The absence of failures in earlier MOTs supports a generally well-maintained vehicle, but the current advisories underscore the importance of addressing these issues promptly to maintain road safety and avoid potential MOT failure risks in the future. The vehicle’s recorded mileage of 43,844 miles at the time of this assessment reflects a moderate annual usage rate of approximately 7,307 miles, which is consistent with the typical driving patterns expected for a six-year-old car of this class. Such mileage accumulation is generally manageable, particularly if the vehicle has not been subjected to heavy or aggressive driving conditions. However, the relatively low annual mileage could also imply periods of prolonged inactivity, which may contribute to issues such as standing corrosion, particularly on brake components, suspension elements, and the exhaust system. The 4M ATX transmission, while robust, benefits from regular servicing to mitigate wear from low-speed, high-torque operations that can occur during short trips or stationary periods. Given the advisories on the front braking system, the prospective buyer should conduct a thorough inspection of the brake pads and discs, focusing on their thickness, surface condition, and signs of uneven wear or glazing. During a test drive, listen for any unusual noises such as squeaking or grinding, which could indicate near-failure of the pads or damage to the discs. Additionally, check for a firm, even pedal feel without excessive sponginess or vibration, which may signal warped discs or hydraulic issues. If the pads are indeed at the minimum safe thickness, replacement should be prioritised, ideally before the next MOT test. Beyond the brakes, the buyer should also verify that the vehicle has been serviced according to the manufacturer’s schedule, particularly for fluid changes—such as brake fluid, coolant, and transmission fluid—which degrade over time regardless of mileage. For the broader vehicle assessment, the buyer should examine the tyres for signs of sidewall perishing or cracking, which can weaken the rubber and compromise safety, especially given the vehicle’s age. Check the tread depth and look for irregular wear patterns that may indicate misalignment or suspension issues. Inspect the suspension components, including coil springs, shock absorbers, and suspension bushes, for signs of wear, such as excessive play, cracks, or oil leakage. The 2020 GLC 300 AMG’s high-performance nature means that the suspension and steering systems may have experienced more stress, so any unusual clunking or rattling during cornering or over bumps should be investigated. The battery should also be tested for strength, as prolonged inactivity can lead to reduced charge capacity or corrosion in terminals. Finally, the buyer should verify that the vehicle’s service book has been updated, particularly for the transmission, as the 4M ATX is known for its longevity but requires periodic fluid top-ups and filter replacements to maintain optimal performance. If the vehicle has been driven regularly, fluid checks should still be performed at least every 60,000 miles or every two years, whichever comes first, to ensure long-term reliability.