2012 Mercedes-Benz B-Class 1.8L Diesel · WD12 RZX

This Mercedes-Benz B-Class presents a notably clean DVSA record, with no advisories recorded across any of the documented tests from 2022 through 2025. Five tests over four years returned a fully defect-free outcome each time, including the most recent pass on 12 July 2025. The single failure listed on 7 July 2025, immediately preceding that pass, is an interesting anomaly worth flagging: a car that fails one test with no defects recorded and then passes the very next attempt suggests a probable test-day technicality rather than a mechanical defect, such as a dashboard warning lamp that was rectified between appointments or a tyre reading that fell just outside the threshold before being replaced. The absence of any recorded advisories across the entire history is unusual for a vehicle now in its fourteenth year and approaching six-figure mileage, indicating that none of the components most commonly flagged on older vehicles have yet been called out for attention by testers. With 111,457 miles accumulated over roughly 14 years, this B-Class averages around 7,961 miles per year, which sits comfortably within the typical usage bracket for a family hatchback of this vintage. The mileage progression between tests appears steady and consistent, with no anomalous jumps or plate-swap irregularities that would suggest clock fraud or significant gaps in service history. There are no extended lay-up periods evident from the test record, with annual MOTs recorded consistently since at least 2022. This kind of regular, moderate usage is generally favourable for mechanical longevity: the engine, transmission and drivetrain components have been kept working without the corrosion risks associated with long stationary periods, and consumables such as tyres and brake friction material will have been replaced at relatively normal intervals. That said, the entirely clean advisory history should be treated as informative rather than conclusive. MOT advisories are limited in scope and only flag items visible or detectable from the test bay; they do not constitute a comprehensive mechanical inspection. A vehicle of this age and mileage is statistically likely to have some wear in suspension components such as front wishbone bushes, anti-roll bar drop links and coil spring seats, even if no tester has chosen to flag them. On a test drive, listen carefully for clonking or knocking from the front end over speed bumps and uneven surfaces, which would suggest worn lower wishbone bushes or top mounts. Pay particular attention to steering response: any vagueness, knocking on full lock, or vibration through the rim under braking may point to worn tie rod ends or tracking arms that have not yet been formally recorded. Brake system condition warrants specific scrutiny given the mileage. Although no brake-related advisories appear, a 111,000-mile car is well within the range where front discs may be approaching their second or third replacement cycle and the caliper slider pins may be beginning to seize. On test, check for any pulling to one side under moderate braking, any pulsation through the brake pedal suggesting disc warpage, and listen for grinding or scraping that could indicate worn pads contacting the disc surface. Additionally, inspect the underside thoroughly on a ramp for any signs of oil misting from the engine or gearbox seals, corrosion around the rear axle mounting points and exhaust mounting rubbers, and the condition of the undertrays, which on B-Class models can sometimes hide emerging corrosion around the rear suspension turret area. A clean MOT history does not eliminate the need for these targeted physical checks, particularly on a premium-branded family car now entering its mid-teens.