1990 Jaguar XJ 4.0L Petrol · H366 DHG

The vehicle presents a clean and straightforward official DVSA test history, with the most recent examination on 2 February 2026 resulting in a pass and no advisories, failures, or recorded defects. With no earlier test entries provided for comparison, it is not possible to identify a maintenance trend of deterioration or improvement over time; however, the clean pass on a 36-year-old motor vehicle indicates that at the point of test the Jaguar was considered roadworthy across all statutory categories, including lighting, braking, steering, suspension, tyres, exhaust emissions, and structural integrity. The absence of advisories is positive but should be treated with a degree of caution, as advisories are often issued for components that are not yet at failure threshold but show measurable wear, and a complete absence may simply reflect the limited test history on file rather than a wholly pristine mechanical condition. The recorded mileage of 157,686 miles over an approximate 36-year lifespan equates to an average annual usage of around 4,380 miles, which is notably low for any road vehicle and particularly so for a large executive saloon such as the XJ. This figure strongly suggests extended periods of standing or very occasional use, perhaps as a second car, a weekend vehicle, or a cherished example used primarily in favourable conditions. Such low annual mileage is a double-edged characteristic: the powertrain, transmission, and major internal wear surfaces are likely to have suffered far less mechanical degradation than the odometer reading might initially imply, but long periods of inactivity are known to accelerate certain forms of deterioration, particularly corrosion of brake discs and caliper slides, drying and cracking of rubber components such as bushes, hoses, and drive belt covers, and degradation of lubricants, brake fluid, and coolant due to calendar ageing rather than mileage accumulation. The relatively low recorded mileage should not therefore be interpreted as an automatic indicator of mechanical superiority. Given the clean test history and the low-mileage, age-dominated usage profile, a prospective purchaser should focus the physical inspection on components that deteriorate with time and standing rather than with use. Brake discs on a vehicle of this age and mileage are highly likely to exhibit surface corrosion, and it is important to confirm that the calipers are releasing correctly and not binding, as seized caliper pistons are a common consequence of prolonged standing; on a test drive, listen for any scraping, grinding, or pulling to one side under braking, and check for a hot-smell from the wheels immediately after a short drive. The braking system fluid should be treated as time-expired, as brake fluid is hygroscopic and typically requires replacement every two to three years regardless of mileage, and a fluid change together with a thorough system bleed should be budgeted for. The cooling system should likewise be examined for perished hoses, deteriorated coolant, and any signs of leaks around the water pump and thermostat housing, all of which are age-related failure points on vehicles of this vintage. Further careful attention should be directed to the tyres, which may exhibit sidewall cracking and perishing from age even if the tread depth remains adequate, and any tyre fitted to the vehicle should be checked for its manufacturing date stamp and for signs of rubber degradation, as perished tyres are illegal regardless of remaining tread. The 12 volt battery is another item that frequently fails on low-use classics, particularly if the vehicle has been stood for long periods; the battery should be load-tested and the charging system output verified to confirm the alternator is maintaining correct voltage. The exhaust system, being largely steel on a vehicle of this era, is highly susceptible to internal and external corrosion and warrants a thorough inspection from the manifold rearwards, including the mounting rubbers and silencer boxes. Suspension bushes, anti-roll bar links, and the rear self-levelling system components, where fitted, should be examined for cracking and deterioration, as these items harden and perish with age. Finally, the prospective buyer should verify the completeness of the service history stamps, confirm that the cambelt or timing chain service intervals have been observed, and consider commissioning an independent pre-purchase inspection from a specialist familiar with the XJ platform, given the complexity of the vehicle's systems and the typical cost of corrective work on a luxury saloon of this vintage.