2005 Mercedes ML 3.0L Diesel · TH54 DAN

The 2005 Mercedes-Benz ML presented for inspection has a current MOT status of PASSED as of 24 February 2026, although this pass was accompanied by several advisories that warrant close attention from a prospective buyer. Reviewing the recent test history, the maintenance trajectory is notably deteriorating rather than stable. In 2023 the vehicle passed with only minor tyre perishing advisories, but across the 2024 and 2025 cycles it has accumulated a recurring pattern of split CV joint boots on both nearside and offside front drive shafts, heavy oil leaks, suspension corrosion, brake pad wear, and tyre shoulder wear. The most recent test in February 2026 escalated to a major failure just four days prior to its eventual pass, with exhaust emissions exceeding the specified level for a turbocharged engine alongside the persistent CV boot and steering gaiter defects. This escalating pattern of advisories and majors over consecutive tests suggests that the vehicle is approaching the threshold where deferred maintenance may result in outright test failures rather than advisories, particularly in relation to its underbody condition. The recorded mileage of 138,998 miles across approximately 21 years equates to an annual usage of around 6,619 miles, which is broadly typical for a vehicle of this vintage and age bracket. However, the MOT history does not contain recorded mileages at each test, so it is not possible to confirm whether there have been periods of significant standing time or conversely rapid mileage accumulation. For a diesel-powered Mercedes-Benz ML of this era and accumulated mileage, the drivetrain, turbocharger, suspension bushes, coil springs, and anti-roll bar links will have experienced substantial wear cycles, and the recorded heavy oil leak from beneath the undertray is consistent with the higher mileage profile typical of such a vehicle. The combination of turbocharged diesel operation and the recorded emission failure on the most recent attempt further indicates that age-related degradation of turbo seals, intercoolers, or associated induction components should be considered a priority inspection area. Given the recurring drive shaft CV boot failures across the 2023, 2024, and 2025 tests, alongside a steering rack gaiter defect in February 2026, a prospective buyer should conduct a thorough physical inspection and a careful test drive. Listen for clicking or knocking noises from the front driveline during full-lock turning manoeuvres at low speed, which would suggest compromised CV joints due to grease loss following boot failure. Inspect the steering rack gaiter for splits and check for any play in the steering or uneven front tyre wear indicative of deteriorated gaiter sealing. The exhaust emission failure warrants a road test under load to detect excessive black smoke under acceleration, which on the M-Class diesel of this era commonly points to worn turbo seals, failing injectors, or a compromised diesel particulate filter. The oil leak advisory repeated across multiple tests must be physically traced; inspect beneath the undertray for active seepage from the sump, front crank seal, oil filter housing, or turbocharger oil feed and return lines, as ongoing neglect risks low oil levels and consequential engine wear. Given the recorded advisories concerning corroded and deteriorated suspension components, general underbody corrosion, and the vehicle's age exceeding two decades, physical examination on a ramp is strongly advised before purchase. The advisories for rear brake pad wear and front tyre shoulder wear suggest that consumable replacement is imminent, and a prospective buyer should verify recent replacement of these items. Inspect all coil springs for fracture, particularly given the documented corrosion, and check suspension bushes, drop links, and anti-roll bar mounts for perished rubber and play. Examine the underbody and structural members for advanced corrosion, paying particular attention to jacking points, suspension mounting areas, and the rear subframe. Given the low annual mileage, the vehicle may have experienced extended standing periods, which can result in brake disc corrosion and potential caliper binding; therefore, during the test drive, verify smooth brake release with no residual pulling to either side. Check tyre sidewalls for perishing and cracking from age rather than tread wear alone, test the 12V battery under load as age-related failure is common, and confirm the service history including recent replacement of engine oil, brake fluid, coolant, and transmission fluid in accordance with calendar-based servicing schedules rather than purely distance-based intervals.