2015 Mercedes-Benz C 2.1L Diesel · RO15 HHA

The 2015 Mercedes-Benz C-Class most recently passed its MOT on 24 September 2025 with two advisories recorded, one relating to a child seat obscuring full inspection of the nearside rear adult belt and the other noting that the rear brake disc is worn, pitted, or scored although not seriously weakened. Reviewing the broader test history, the vehicle has demonstrated a generally stable and compliant maintenance trend, passing every annual test since the 2019 tyre-related dangerous failure, which appears to have been rectified immediately and has not recurred. A small prop shaft rubber doughnut advisory appeared in 2021, front lower windscreen damage was logged as a minor in 2024, and rear brake disc advisories have appeared in both 2024 and 2025, suggesting an ongoing wear pattern at the rear axle that warrants close attention during any prospective purchase. With 98,097 miles recorded over approximately 11 years, this C-Class has averaged around 8,918 miles per year, which is broadly typical for a vehicle of its age and segment. The mileage progression between MOT tests is consistent and shows no unusual gaps or sudden accumulations, which suggests steady regular use rather than long periods of standing or excessive high-mileage driving. From a mechanical standpoint, this usage profile is generally favourable because regular running helps to keep seals lubricated, prevents brake seizure from corrosion, and maintains battery condition, although the modest annual mileage means calendar-based degradation of fluids and certain rubber components remains a relevant consideration. Given the recurring advisories on the rear brake discs across the 2024 and 2025 tests, a prospective buyer should arrange a physical inspection of the braking system, paying particular attention to the condition of both rear discs for lipping, corrosion pitting around the outer circumference, and thickness relative to the manufacturer’s minimum specification. On a test drive, listen for any rear brake shudder under firm application, uneven pedal feel, or a grinding or scraping noise which could indicate that the discs have now worn beyond serviceable limits or that the calipers are failing to retract properly. The recorded prop shaft doughnut advisory from 2021 also merits a check, as deterioration of this flexible coupling can lead to driveline vibration, clonks on take-up of drive, or play in the propshaft when the vehicle is loaded or reversed, so a thorough inspection underneath for perished rubber, grease leakage, or play at the doughnut is recommended. Beyond the recorded advisories, the age and mileage of this C-Class warrant several practical checks that are not necessarily reflected in the MOT record. Tyres of 245/40 R18 fitment were the subject of a dangerous tread depth failure in 2019, and although the issue was resolved, the sidewalls of the tyres fitted should be examined carefully for perishing and cracking consistent with age, particularly given that ten to eleven-year-old sidewall rubber can deteriorate regardless of remaining tread depth. The brake fluid, coolant, and automatic transmission fluid should be confirmed as recently renewed in line with manufacturer intervals, as these degrade on a calendar basis rather than purely with mileage. Other age-related items worth verifying include the condition and charge state of the 12V battery, signs of damp or staining on the front carpets suggesting blocked air conditioning drains, any evidence of oil or coolant residue around the engine and beneath the vehicle on level ground, and the general condition of the rear propshaft rubber doughnut given its prior advisory. A thorough road test covering motorway speeds, urban stop-start driving, and reverse should be carried out to detect any suspension clonks, steering vagueness, transmission hesitation, or unusual vibrations before committing to purchase.