2018 Mercedes-Benz E 1.9L Diesel · WN18 CWU

A pattern of structural wheel integrity and tyre wear is the defining mechanical thread running through this E-Class's MOT history. The most recent test on 27 March 2026 returned a clean pass with no advisories, which suggests the immediate safety items have been addressed, but the underlying story only emerges when looking at the wider record. On 17 March 2025 the vehicle failed on two dangerous defects: a fractured nearside rear road wheel and a fractured offside rear road wheel. These are not routine wear items but catastrophic failures of the wheels themselves, and a fractured wheel can lead to sudden loss of control at speed. The advisories carried alongside that failure, namely an insecure engine air intake pipe and front tyres wearing on the edges, were repeated again on the re-test eleven days later, indicating that the deeper mechanical concerns were left unresolved at the point of retest. The tyre edge wear pattern is consistent across multiple tests in 2023, 2024, and 2025, pointing to either persistent alignment geometry issues or worn suspension components that are pulling the geometry out of specification over time. At 96,164 miles over an eight-year life, this car has averaged around 12,000 miles per year, which sits at the higher end of typical usage for a Mercedes-Benz E-Class of this age and trim level. There are no significant gaps in the MOT testing record and no evidence of prolonged off-road storage, so the recorded mileage is likely to be representative of continuous operational use. This level of annual mileage accelerates wear on the consumables and mechanical components that are repeatedly flagged in the advisories, including tyres, suspension geometry components, and underbody hardware. The annual test cadence shows no multi-year lay-up periods that would typically raise concerns about seized brakes, deteriorated rubber, or moisture ingress in fluids, which is reassuring, but the high accumulation rate means components such as brake discs, pads, shock absorbers, coil springs, and suspension bushes will have been worked considerably harder than on a lower-mileage example. Given the recurring edge wear on the tyres, a prospective buyer should treat wheel alignment as a priority inspection item. On a test drive, pay particular attention to steering pull to either side under braking or on a straight motorway stretch, any vibration through the steering wheel that changes with road surface, and uneven steering return after corners, as these can all indicate worn control arm bushes, tie rods, or dropped suspension links. The fractured rear wheels from the 2025 failure are particularly concerning because wheel fractures can stem from corrosion around the hub mounting face, previous impact damage that has propagated through the metal, or subframe mounting integrity issues. During the physical inspection, carefully examine the rear wheels for any signs of corrosion pitting around the centre bore, hairline cracks radiating from the lug holes, or distortion of the wheel dish, and ask the seller to provide evidence of replacement wheels with part numbers and manufacturing dates. Listen on the test drive for any clonking or knocking from the rear suspension over speed humps and rough tarmac, as this could indicate worn rear trailing arm bushes or subframe mount deterioration following the wheel failure episode. The persistent advisory regarding the engine air intake pipe being insecure is a relatively minor item in isolation but suggests general underbonnet attention may be lacking. When inspecting the vehicle, check that the intake pipework between the airbox and turbocharger or throttle body is fully clipped and seated, with no play when the pipe is twisted by hand, and verify that the undertray has been removed for a proper inspection or that the seller can demonstrate the condition of components hidden beneath it. Under the bonnet, look for any signs of oil misting around the cam covers, turbocharger oil feed lines, and the PCV system, as high-mileage Mercedes petrol and diesel engines commonly develop minor oil leaks in these areas. On the road, listen for any irregular idle, hesitation under throttle, or whistling noises that could point to boost leaks from aged intake or intercooler piping. Finally, request a clear service history with documented cambelt or timing chain replacement intervals appropriate to the engine variant, as a high-mileage E-Class of this generation is approaching or has passed the critical timing component replacement window, and any ambiguity in this area should be reflected in the offer price or rejected outright.