2003 Mercedes-Benz ML 5.4L Petrol · SS03 AMG

The most recent DVSA examination on 3 March 2026 resulted in a PASS, although two advisories were recorded. A deteriorating front registration plate was noted, which is largely cosmetic and does not present a mechanical concern, but an oil leak from the gearbox cooler pipe was flagged once again. Looking back across the last four MOT entries, the vehicle has passed three consecutive tests but has carried the gearbox cooler pipe oil leak advisory throughout this period, alongside a recurring front registration plate deterioration advisory. A previous failure on 4 March 2024 was attributed to a front passenger door that could not be opened from outside the vehicle and seriously defective headlamp lenses, both of which appear to have been rectified, as no further issues with these items have been recorded. Overall, the maintenance trend appears reasonably stable, though the persistent oil leak advisory warrants monitoring to ensure it has not progressed beyond minor seepage. With a recorded mileage of 101,754 miles over approximately 23 years, this ML is averaging around 4,400 miles per year, which is considerably below average for its age and likely indicative of extended periods of standing or very light use. Such low annual mileage tends to place greater stress on certain components than higher mileage would, as seals, gaskets, hoses, brake calipers, and underbody protection all degrade through calendar ageing and lack of regular use rather than purely through wear. Mileage accumulation appears consistent across the recorded MOT history, with no significant gaps or sudden increases to suggest clock irregularities, though prospective buyers should still verify the continuity of service records and ensure the figure is supported by corresponding documentation. Given the recurring gearbox cooler pipe oil leak advisory, a prospective buyer should closely inspect the underside of the engine and transmission area for fresh oil residue, paying particular attention to the pipe unions and any signs of weeping that may have worsened since the last test. On a test drive, listen for any whining or humming from the gearbox that could indicate fluid loss, and check the transmission fluid level on the dipstick if accessible. The offside front brake pipe advisory recorded in 2022 and 2023, noted as corroded but covered in grease, suggests that attention may now be due to this component, particularly given the vehicle's age and exposure to road salts in winter months. It would be prudent to have the brake pipes inspected for corrosion, and any seizing calipers or warped discs checked, as standing vehicles are particularly prone to brake caliper binding and surface corrosion on discs. Beyond the recorded advisory items, several age-related checks are highly relevant for a 23-year-old ML of this profile. Tyres should be examined carefully for sidewall perishing and cracking, as tyres over six years old deteriorate regardless of tread depth, and a date code inspection is recommended. The 12V battery is likely due for replacement, given its age, and a standing vehicle puts additional strain on battery health through parasitic drain. Brake fluid and coolant should be considered for replacement on a time basis rather than mileage, as both are hygroscopic and degrade with age. The underbody, subframes, and suspension components, including coil springs, bushes, and anti-roll bar links, should be inspected for corrosion and perishing, with particular attention to the rear air suspension system if fitted, as these components are known to fail with age. Finally, a thorough check of the service book history is essential, with confirmation that timing chains, filters, and major service intervals have been completed in line with manufacturer schedules.