1978 Mercedes-Benz 450 4.5L Petrol · DJE 727

The 1978 Mercedes 450 remains roadworthy as of its most recent MOT on 11 May 2026 at 128,825 miles, passing with minor advisories. The maintenance trend is broadly stable rather than improving, with several recurring issues persisting year on year. Oil leaks from the engine, gearbox, and rear differential have appeared consistently since at least 2022, each time deemed not excessive but still flagged. General underside corrosion has been noted in every test from 2023 onward, and the 2024 test specifically identified a fractured offside front structural area, albeit without significant loss of rigidity. A binding offside front brake appeared in both 2022 and 2024, suggesting an intermittent caliper or hydraulic issue that has not been permanently resolved. The mileage accumulation tells a clear story of very gentle use. Across the five-year MOT record from May 2022 at 127,203 miles to May 2026 at 128,825 miles, the car covered just 1,622 miles, averaging roughly 405 miles per year. Over its full 48-year life, the total of 128,825 miles equates to approximately 2,684 miles annually, well below typical usage. The record shows no gaps in annual testing and no sudden jumps in mileage, indicating the car has been used sparingly but kept in active, taxed condition rather than sitting unused for extended periods. A buyer should treat the persistent oil leaks as a priority inspection point. Engine, gearbox, and rear differential leaks that recur across multiple tests suggest deteriorating gaskets or seals that may eventually worsen beyond the "not excessive" threshold. The underside corrosion, particularly the 2024 advisory noting a structural fracture near the offside front, warrants a thorough inspection on a lift. While the tester judged rigidity unaffected, corrosion on a 48-year-old steel unibody can accelerate unpredictably, especially around suspension mounting points and sill sections. The binding offside front brake also demands attention, as a dragging caliper can overheat brake discs, accelerate pad wear, and compromise braking balance. Beyond the flagged items, the low mileage means consumable components such as tyres, rubber bushes, and perishable hoses may have aged more from time than use. Dry perished suspension bushes, cracked brake hoses, and deteriorated engine mounts are common on lightly used classics and should be checked carefully. The overall picture is a well-preserved but aging vehicle with manageable faults that have been tolerated rather than corrected. A pre-purchase inspection focused on structural corrosion depth, brake hydraulics, and the source of the oil leaks will give the clearest picture of what remediation lies ahead.