1991 Jaguar XJS 4.0L Petrol · J177 DYO

The most recent MOT test on 2026-05-26 resulted in a passing outcome, though it included an advisory for an oil leak that remains moderate in severity. Despite this, the vehicle’s MOT history reveals a pattern of persistent issues rather than a clear improvement or stability. The 2026 test follows a failure in May 2025, where major defects—particularly the excessively worn rear suspension arms—were identified, alongside recurring advisories such as wheel bearing play and coil spring corrosion. The 2024 MOT also highlighted similar concerns, including corroded coil springs and fuel pipe corrosion, suggesting that while the vehicle has passed individual tests, underlying mechanical wear is not being adequately addressed. The presence of multiple advisories across multiple years indicates that the owner may have been neglecting critical maintenance, particularly in suspension, wheel bearings, and fluid integrity, which could escalate into costly failures if left unchecked. The recorded mileage of 96,923 miles for a vehicle aged approximately 35 years represents a remarkably low annual usage rate of around 2,769 miles per year. This is far below the typical wear rates for a vehicle of this era, which often accumulate 10,000 to 20,000 miles annually under normal use. Such low mileage can lead to several critical issues, including accelerated wear from prolonged standing, particularly in suspension components, wheel bearings, and brakes, which are more prone to corrosion and binding when stationary for extended periods. Additionally, fluids such as brake fluid and coolant degrade over time due to evaporation and oxidation, even without active use, which can compromise performance and safety. The absence of recent high-mileage activity means that consumables like oil, filters, and brake pads may have been neglected, further exacerbating the wear observed in the MOT history. Given the vehicle’s history of oil leaks, wheel bearing play, and corroded suspension components, the prospective buyer should conduct a thorough inspection focusing on the suspension system, wheel bearings, and fluid integrity. On a test drive, listen for unusual noises such as clunks or rattles from the rear suspension arms, which may indicate further wear or detachment of the trailing arms. Check for uneven tyre wear patterns, which could signal misalignment or suspension issues, and inspect the tyres for cracks or perishing, particularly on the offside front and rear tyres noted in previous MOTs. The oil leak should be addressed immediately, as it may stem from a failing oil seal or gasket, which could lead to engine damage if not repaired. Additionally, visually inspect the coil springs for any signs of failure or excessive sagging, and check for fluid leaks around the fuel pipe, which may indicate corrosion or a failing connection. For the buyer, the next critical steps include verifying the condition of the 12V battery, as prolonged inactivity can cause corrosion on terminals and a decline in capacity. Inspect the brake system for signs of corrosion on discs or binding calipers, especially on the near-side front wheel, where slight play was noted in previous MOTs. Check the brake fluid level and condition, as old fluid can become gelled and ineffective. Finally, ensure that all fluids—oil, coolant, and brake fluid—are topped up and replaced according to the manufacturer’s guidelines, ideally every 2–3 years regardless of mileage. Given the vehicle’s age and the recurring advisories, a comprehensive mechanical inspection by a qualified Jaguar specialist is strongly recommended to assess the extent of suspension and bearing wear, and to address the oil leak and corroded components before they escalate into major failures.