2018 Mercedes-Benz C 4.0L Petrol · NSS 1

The most recent DVSA MOT test for this 2018 Mercedes-Benz C-Class was conducted on 25 March 2026, resulting in a clean pass with no defects or advisories recorded. Reviewing the trajectory across the documented test history, the maintenance trend appears broadly stable with no recurring mechanical failure categories, though the rear suspension damping components have shown progressive deterioration that warrants close attention. The earlier 2021 advisory on an offside rear tyre and the 2021 major failure on the nearside rear shock absorber correspond with advisories recorded nine months later on both rear shocks for light oil misting, suggesting that the original shock absorber failure was addressed but the offside unit may not have been replaced at the same time and has continued to degrade. The fact that the 2026 test returned clean suggests the dampers have not deteriorated to a failable level, but the recorded progression indicates these components are approaching the end of their functional life. With approximately 38,962 miles recorded over eight years, this vehicle has averaged only around 4,870 miles per year, which is notably low for its age and segment. Such low annual mileage typically reflects a combination of light general use and extended periods of standing, which carries its own set of mechanical considerations. Long periods of inactivity can accelerate corrosion on brake discs due to surface rust accumulation, encourage binding of brake calipers from stagnant pistons and perished guide pin boots, and degrade the 12V battery through repeated partial discharge cycles. The drivetrain, engine internals, and clutch or torque converter components will have experienced less wear than would be expected for the vehicle's age, but rubber components, fluids, and electrical items tend to degrade on a calendar basis regardless of mileage covered. Given the low usage profile of this C-Class, a prospective buyer should conduct a thorough physical inspection beyond the MOT documentation. Brake discs should be examined for any significant lipping at the outer edge, which would suggest they have worn beyond serviceable limits and require replacement, and the calipers should be checked for any signs of seizing or uneven pad wear. The 12V battery should be load tested, as Mercedes-Benz auxiliary and main batteries are known to fail prematurely on low-use vehicles, and any warning messages relating to battery age on the instrument cluster should be investigated. Tyres warrant careful scrutiny for sidewall cracking and perishing from age-related rubber degradation, even if the tread depth remains adequate, and a check of the production date codes on the sidewalls is advisable to confirm they are not excessively old. All fluid services, including engine oil, brake fluid, coolant, and transmission fluid, should be verified as having been conducted within manufacturer-recommended intervals, as time-based degradation will occur regardless of mileage. On a test drive, particular attention should be paid to the rear suspension, given the documented history of shock absorber issues. Any clonking noises over bumps, excessive rear body sway during cornering, or a harsh, unsettled ride quality over uneven road surfaces would indicate that the rear dampers have deteriorated further since the last test. The brake pedal should feel firm and progressive without any sponginess that might suggest caliper binding or hydraulic issues from infrequent use, and the vehicle should track straight without pulling, which could indicate uneven brake pad transfer or a sticking caliper. Listen for any unusual transmission hesitation or rough idle, as low-mileage vehicles can occasionally develop issues from short journeys not allowing components to reach operating temperature. Finally, verifying a complete and up-to-date service history book with stamps from a recognised Mercedes-Benz specialist or reputable independent garage will provide crucial reassurance that time-based maintenance items have been attended to in line with the manufacturer's specifications.