2018 Mercedes-Benz A-Class 2.1L Diesel · AL07 TTY

The defining mechanical story of this 2018 Mercedes-Benz A-Class centres on a creeping rear suspension wear issue that has only just begun to surface in the official record. Across its seven recorded MOT tests, the vehicle has passed every examination without a single failure or major defect, a respectable roadworthiness record at first glance. However, the most recent test on 19 September 2025 introduced advisories on both rear longitudinal arm bushes, flagged as worn but not yet resulting in excessive movement. Given the bilateral nature of the advisory and the relatively high annual mileage, this is likely the early signal of a progressive suspension degradation pattern that buyers should take seriously, particularly as the vehicle approaches the 90,000-mile threshold where rubber components on Mercedes torsion-beam and multi-link rear axles commonly begin to deteriorate. With 86,507 miles accumulated over approximately eight years of use, this A-Class has covered around 10,800 miles annually, which sits broadly in line with typical UK average driving patterns. There are no significant gaps in the testing history, with annual examinations consistently carried out from 2021 through 2025, and mileage progression appears steady rather than erratic. This is consistent with a car in regular daily use rather than one subjected to long periods of standing or unusually high long-distance motorway accumulation. Mechanically, this usage profile means the vehicle is neither under-stressed (which can bring its own issues with seized components and degraded fluids) nor over-stressed, but the higher-than-average annual figure does place corresponding wear demand on consumables such as brake discs, pads, tyres, and the rear suspension components now beginning to flag. A prospective buyer should prioritise a thorough physical inspection of the rear suspension assembly, given the bilateral longitudinal arm bush advisories recorded at the 2025 test. On a road test, listen for clonking or knocking noises from the rear axle when traversing speed bumps, potholes, or uneven surfaces, and pay attention to any vagueness or delayed response from the rear end during direction changes. With the vehicle elevated on a ramp, the rear bushes should be physically probed for play using a pry bar, as MOT testers can only assess movement within prescribed limits; any perceptible slack now suggests replacement is imminent. Additionally, examine the rear coil springs for any signs of cracking or sagging, as these commonly deteriorate alongside bush wear on A-Class chassis of this generation. The earlier advisories on front brake discs in 2021 and front tyre inner and outer edge wear in 2023 also warrant attention. The 2023 edge wear on both front tyres can be indicative of either suspension geometry misalignment, typically camber or toe settings, or simply worn front suspension components altering the contact patch. Have the wheel alignment checked and inspect the front suspension arms, anti-roll bar links, and track rod ends for play, as any deterioration here will accelerate further tyre wear and compromise handling. The 2021 brake disc advisories noted pitting and scoring without serious weakening; at the current mileage these discs will almost certainly require replacement if not already attended to, so verify disc thickness and check for brake judder or vibration under heavy braking. Finally, inspect the windscreen for the minor damage noted in 2021 and ensure it has not propagated, and examine the exhaust mounting rubbers and underbody for any corrosion, as Mercedes vehicles of this era can be susceptible to rust in these areas once past the mid-decade mileage mark.