2018 Mercedes-Benz C 1.9L Diesel · A19 SAS

A pattern of tyre wear and thinning rear brake pads has emerged across three consecutive MOT tests, even though the car has passed every examination on record. The most recent assessment on 13 November 2025 was completed with no defects recorded, marking a clean return to form after the 2024 test flagged an offside rear tyre approaching the legal limit. Prior to that, the November 2023 test carried four advisories: both nearside tyres and the offside rear tyre were worn close to the legal limit or on their edges, alongside rear brake pads reported as wearing thin. Tests in 2021 and 2022 were returned with no advisories at all, suggesting that the wear issues became apparent only as the vehicle accumulated further use from 2023 onwards. The advisory pattern is specific rather than systemic, but it does indicate that certain consumable items are reaching the end of their service life faster than the rest of the package. Recorded mileage of 47,264 miles over an eight-year span equates to roughly 5,900 miles per year, which is well below average for a 2018 C-Class and points to either light regular use or periods of limited activity. There are no large unexplained jumps between test readings, and the absence of any recorded failures or long gaps in the testing history means the mileage accumulation appears consistent rather than erratic. Lower annual mileage of this nature typically reduces wear on major drivetrain components and the internal combustion components, but it can also allow brake discs to corrode on the surface from underuse, tyres to develop flat spots or sidewall deterioration from standing, and rubber components such as suspension bushes to dry out and crack. The advisories themselves, particularly the edge wear noted on multiple tyres, are at least consistent with a vehicle that has been used gently and possibly stored for stretches between journeys. A prospective buyer should focus the physical inspection on the four corners of the car where the advisories were concentrated. Inspect all four tyres closely for uneven shoulder wear, feathering along the tread blocks, and any signs of cracking in the sidewalls, as these would suggest alignment or suspension geometry issues that a simple advisory may not fully reveal. The rear brake pads were recorded as wearing thin in 2023, so the rear discs and pads should be examined for material remaining on the pad backing plates, lipping on the disc edges, and any binding or stiffness in the caliper slides that could explain accelerated wear. On the test drive, listen for any clonking or knocking from the suspension over uneven surfaces, particularly from the rear axle components such as the trailing arms and bushes, and pay attention to steering precision, as any vagueness or pull to one side could indicate worn tie rods or bushes that would also contribute to the edge wear patterns seen on the tyres. The front end warrants equal scrutiny given that nearside front tyre wear was flagged alongside the rear tyres in 2023. Check the front brake discs for runout and the callipers for smooth operation, and inspect the condition of the suspension springs and top mount bearings for any signs of sagging or noise on compression. Because the vehicle has covered relatively low mileage, the brake hydraulic system and the cooling system should be examined for age-related deterioration rather than wear, with particular attention to any seepage from brake calipers, flexible hoses, and the radiator and expansion tank seals. A thorough road test should include several firm stops from higher speed to confirm straight-line stability and pedal firmness, together with low-speed manoeuvres over broken surfaces to expose any latent suspension or steering wear that has yet to appear on an MOT advisory.