1978 Jaguar XJS 5.3L Petrol · GGH 10T

The DVSA history for this 1978 Jaguar XJS presents an exceptionally sparse testing record, with only two MOT passes documented over the available period, the most recent being a clean pass on 16 July 2024 with no advisories or defects recorded. Prior to that, the vehicle passed on 19 November 2021, again with a clean sheet. The absence of any advisories across both tests is encouraging from a roadworthiness perspective, suggesting that the braking, suspension, lighting, and exhaust systems were functioning within legal limits at the time of examination. However, the lack of recorded defects should be interpreted cautiously on a vehicle of this vintage and age, as components prone to degradation on older Jaguar XJS models such as corrosion of the front subframe, rear suspension radius arm bushes, and brake pipe integrity are often only flagged when they have reached an advanced state of deterioration. The two-test history simply confirms statutory compliance at those points rather than providing a longitudinal picture of mechanical decline or progressive wear. Against a 48-year lifespan, the recorded 75,203 miles equates to an annual average of roughly 1,567 miles per year, which is notably low for a classic grand tourer of this type. The gap between the 2021 and 2024 tests, combined with the absence of a test result in 2022 or 2023, raises questions about the regularity of use during that period. Such low mileage on an XJS frequently indicates either careful intermittent use or extended periods of storage, both of which carry distinct mechanical implications. Prolonged standing can lead to internal corrosion in brake calipers, drying and cracking of flexible brake hoses, hardening of suspension bushes, flat-spotting or sidewall deterioration of tyres, and moisture ingress within the cooling and fuel systems. Equally, rubber seals, drive belts, and the various gaskets throughout the AJ6 engine bay are all vulnerable to degradation when a vehicle is not exercised regularly. The mileage consistency between the two recorded tests cannot be verified due to the limited data, but the overall low accumulation rate warrants close physical inspection of components that suffer from disuse rather than wear alone. For a prospective buyer, the absence of advisories on the MOT record is not a substitute for a thorough pre-purchase inspection on a car of this age. Particular attention should be paid to the front crossmember and rear subframe mounting areas for any visible corrosion, as these are well-documented weak points on the XJS platform and would not necessarily be flagged unless structurally significant. The rear suspension radius arms and their associated bushes should be examined for cracking or perishing, and the ride height assessed for any sagging that might indicate weakened coil springs. On a test drive, listen for clonking or knocking noises from the rear suspension over uneven surfaces, which often point to worn trailing arm bushes. Brake pedal feel should be firm and consistent, with no sponginess that could suggest perished flexible hoses or air ingress within the old hydraulic system, and the car should pull up evenly without any pulling to one side that could indicate a binding caliper after periods of standing. The engine bay of any low-mileage XJS warrants close scrutiny for oil leaks from the sump gasket, rocker cover seals, and the rear main seal, all of which can seep after long storage. Coolant hoses and the header tank should be checked for staining or weeping, and the radiator core examined for corrosion or clogging. Given the vehicle's age, a compression test or at minimum a thorough warm-up observation would be advisable, as low mileage achieved through irregular use can mask underlying mechanical wear or internal corrosion within the cooling jackets. Listen on start-up for any timing chain rattle from the front of the engine, a known concern on these units, and verify that the automatic transmission selects cleanly through all ranges without flare or hesitation. Tyres should be checked carefully for sidewall cracking, as old rubber that has stood for extended periods can fail despite apparently adequate tread depth, and all fuel lines, particularly those at the rear of the engine bay where routing is close to the exhaust manifold, should be inspected for hardening or surface cracks.