2015 Mercedes-Benz E 2.1L Diesel · C5 DWG

The vehicle holds a valid MOT certificate issued on 26 November 2025 at 65,428 miles, but the maintenance trend is not reassuring. The most recent test flagged a severely deteriorated Offside Front Lower Suspension arm ball joint dust cover, a defect that exposes the joint to water and grit, accelerating wear and risking premature failure. This advisory sits alongside a pattern of corrosion-related defects that have persisted across multiple years. The record shows a worsening trajectory in certain areas, particularly brake pipe corrosion, rather than a stable or resolving picture. The mileage profile is notably low for an eleven-year-old vehicle. Between the December 2022 test at 46,458 miles and the November 2024 test at 57,670 miles, the car covered 11,212 miles in nearly two years, yet in the following twelve months to November 2025 it recorded just 7,758 miles. That final interval is unusually low and suggests either very light use or a period of prolonged standing. Extended sitting can cause brake discs to surface-corrode, tyres to flat-spot, and rubber suspension bushes and dust covers to perish from ozone and lack of movement, which aligns with the defects now appearing. The repeated identification of corroded front outer brake pipes in the November 2024 test, both nearside and offside, points to an ongoing moisture or salt ingress issue rather than a one-off event. A buyer should have the entire brake pipe run inspected for pitting and wall thickness, paying close attention to clips, unions, and any areas where pipes run along the subframe or inner wings. The corroded pipes were noted as being covered in grease or other material, which can trap moisture against the metal and mask the true extent of the corrosion during a visual inspection. The suspension ball joint dust cover defect from the November 2025 test demands immediate attention. A split or perished cover means the grease inside the joint has likely been contaminated, and the joint itself should be checked for play. Beyond that, a thorough underbody inspection is advisable, focusing on the subframe mounting points, rear suspension bushes, and the exhaust system for corrosion. Low-mileage vehicles that stand for long periods often develop localised rust in areas that would otherwise self-clean through regular heat cycling. A test drive over rough surfaces will reveal any knocking or clunking from worn front-end components.