2000 — 2003
4.0L Supercharged AJ-V8 - XJR Performance
Petrol
Perform a cold start check and listen for timing chain rattles. | Description: While the X308 AJ-V8 is a refined engine, early models with plastic secondary chain tensioners are worth monitoring; if you hear a metallic 'slap' at idle, it is common to consider a professional inspection of the chain guides.
Test the transmission under light load during your test drive. | Description: While driving, pay attention to the smoothness of gear changes; these Mercedes-sourced 5-speed automatics are robust, but a fluid flush can often improve shifting behavior in cars of this age.
Check the suspension air-ride settings and ride height. | Description: Check this by leaving the car parked overnight; if you notice it 'sinking' at one corner, it is worth consulting a specialist, as the air suspension bellows can eventually experience age-related fatigue.
Inspect the headliner and dashboard leather. | Description: Look closely at the cabin upholstery; in NZ's bright UV climate, it is common for the headliner to sag and the leather dash trim to shrink or lift, which may eventually require upholstery restoration.
Usually marks the time to verify the service history for cooling system refreshes and potential transmission fluid changes.
Often the stage where suspension bushings and engine mounts might show signs of wear, potentially impacting the legendary ride quality.
A point where comprehensive electrical system checks and routine sensor maintenance become beneficial to ensure continued reliability.
Prioritise a full cooling system flush, as old coolant can be corrosive to internal engine components.
Verify the condition of the brake hoses and fluid to maintain safety and responsiveness.
Check for any signs of oil weeping from the valve cover gaskets, a minor but standard task for these engines.
Ensure the air conditioning system is blowing cold; a simple regas can often make a world of difference.
Inspect the spark plugs and ignition coils, as these play a key role in the smooth performance of the supercharged engine.
Estimated repair costs if issues arise
If the vehicle has not yet been upgraded to the metal-bodied tensioners, it is sensible to consider this as part of your Future Budget Planning to protect the longevity of your engine.
Should you notice a slow leak in the air bags, you might eventually need to budget for replacing the struts; many owners find that sourcing quality aftermarket replacements can be a great way to manage costs.
The Eaton supercharger is a reliable unit, but depending on the car's history, you might eventually need to budget for an oil service of the unit itself to keep it running quietly and efficiently.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer