1978 Jaguar XJS 5.3L Petrol · TUJ 877H

The most recent MOT test on the Jaguar XJS took place on 2024-12-30, resulting in a passing grade, though the vehicle carried multiple advisories that indicate ongoing but non-dangerous issues. This follows a failure in December 2024, where the test revealed critical defects including dangerous front tyre tears, binding service brakes on both front axles, and a malfunctioning offside rear position lamp. The transition from failure to passing suggests either corrective action was taken between tests or that the advisories from the latest MOT do not yet constitute immediate road safety risks. However, the persistence of binding brakes and corrosion advisories on critical suspension and structural components—particularly the subframe sills and rear suspension arms—demonstrates a pattern of wear that warrants ongoing vigilance rather than a clear improvement in maintenance stability. The recorded mileage of 69,765 miles for a vehicle aged approximately 48 years is unusually low, reflecting an annual usage rate of around 1,453 miles, which is far below the typical wear rates for such an older car. This low mileage could imply periods of prolonged inactivity, particularly if the vehicle has been stored for extended durations, which accelerates issues like corrosion, tyre perishing, and fluid degradation. Conversely, if the mileage is genuinely low due to light use, the absence of higher wear indicators such as excessive suspension or drivetrain wear might suggest that the vehicle has been maintained relatively well despite its age. However, the discrepancy between mileage and age raises concerns about potential neglect, as standing vehicles are particularly susceptible to corrosion at critical joints and standing brake systems, which can lead to binding or failure over time. Given the MOT history, the buyer should prioritise a thorough inspection of the braking system, focusing on the front discs and calipers for signs of binding or excessive heat damage, which could exacerbate the reported binding issues. During a test drive, listen for uneven brake pedal travel, pulsations, or grinding noises, and check for excessive brake dust accumulation around the wheels, which may indicate uneven wear or potential disc warping. The front tyres, which failed the MOT due to structural tears, must be replaced immediately, as these defects pose a serious safety risk and cannot be repaired. The advisories on corroded suspension components, particularly the subframe sills and rear suspension arms, should prompt inspection of these areas for signs of rust penetration or structural compromise, which could compromise handling and stability. If the vehicle has been stored, verify that the engine and transmission fluids are fresh and that the 12V battery is fully charged and free from corrosion at terminals, as standing fluids can degrade rapidly. For the buyer, the next critical steps include replacing the front tyres with appropriate all-season or winter tyres, as the existing condition is unsafe and likely to worsen with further use. The binding brakes should be addressed promptly by a qualified mechanic to diagnose and rectify the root cause, which could involve disc or pad replacement, caliper lubrication, or even brake system bleeding to remove air. Additionally, the corrosion advisories on the subframe and suspension arms necessitate a detailed visual inspection for rust progression, with potential reinforcement or replacement if critical components are severely affected. While the low mileage suggests the vehicle may not have undergone extreme wear, the standing corrosion and fluid degradation risks remain, so a comprehensive service check—including fluid top-ups, filter replacements, and a check on the exhaust system for leaks or emissions compliance—should be scheduled within the next 12 months. Finally, the buyer should consider a pre-purchase inspection by a qualified Jaguar specialist to assess the structural integrity of the subframe, the condition of the rear suspension, and the overall mechanical health of the vehicle, particularly given the history of binding brakes and tyre failures.