2012 Mercedes-Benz R-Class 3.0L Diesel · GL61 VEH

The most recent MOT on 12 September 2025 was a Pass, with only an advisory noting a minor oil leak that is not excessive. This follows a failed test a day earlier for the same oil leak and a missing front‑right steering rack gaiter, and a failed test in February 2024 that highlighted fuel‑cap leakage and sub‑frame corrosion. While the vehicle has now cleared the test, the pattern shows a mixture of recurring minor faults and occasional major items; overall the trend is stabilising but the presence of repeated advisories means the maintenance picture is still marginal and should be monitored closely. At 120,600 miles the R‑Class has averaged roughly 8,600 miles per year over its fourteen‑year life, a usage rate that sits comfortably within normal UK expectations. There are no obvious periods of extreme low mileage that would suggest long-term storage, nor any spikes indicating heavy short‑term use. Consequently the wear on consumables such as tyres, brakes and suspension components is consistent with age and mileage rather than abuse, but the cumulative mileage does mean that items subject to wear—particularly the brake discs, CV joints and steering rack boots—are likely approaching the end of their service life. When inspecting the vehicle, pay particular attention to the front‑right steering rack area; the missing gaiter can allow dirt ingress that accelerates rack wear and may produce vague steering play or a gritty feel when turning. Verify that the CV boot on the off‑side rear drive shaft is intact and free of cracks, as the 2024 advisory indicated severe deterioration; a failing boot will often be heard as a clicking or whine on acceleration and may leak grease onto the wheel rim. The oil leak noted in the last two MOTs should be traced to its source—whether a valve cover gasket, oil filter housing or oil pan seal—and confirmed that the drip rate remains within the permissible limit; any sudden increase could lead to low oil level warnings or engine noise. Examine the front tyres for uneven wear, especially on the edge of the right‑hand tyre, and check the tread depth across the tread face; edge wear can signal mis‑alignment or worn suspension bushings, which should be felt as a wandering feel or a vibration at higher speeds. The brake discs on both axles have been flagged as pitted and scored, though not yet structurally compromised; however, with the vehicle now over a decade old, the discs are likely nearing the point where replacement is advisable to avoid brake shudder or reduced stopping performance, particularly under heavy braking. Corrosion notes on the rear sub‑frame and anti‑roll bar, while not yet critical, merit a visual inspection for any signs of rust perforation or compromised welds, especially around mounting points that could affect rear‑wheel alignment or cause noise over bumps. The fuel‑cap sealing issue recorded in 2024 should be checked for a proper seal to prevent evaporative emissions failures and potential fuel loss. Finally, given the age, confirm the condition of the 12‑volt battery (load test), inspect all rubber hoses and coolant for signs of ageing, and ensure the service book shows regular oil changes and fluid replacements. Addressing these items before purchase will mitigate the risk of unexpected breakdowns and bring the R‑Class back to a more robust road‑worthy state.