EraVerdict: A cultured supercharged sports sedan that can be a bargain — if the timing-chain tensioners are the later metal type and the Nikasil question is settled for early cars.
At a glance
Risk 4/5 Market: Supercharged cat sedan
Must-have records:
- Secondary timing tensioner upgrade (3rd-gen metal)
- Water pump (metal impeller)
- Supercharger / cooling service
- Nikasil vs steel-liner confirmation (pre-Aug 2000)
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Parts & tools: Shop parts at Summit Racing.
Buy-risk rundown
| Issue | Symptom | How to check | Typical cost (as of Nov 2026) |
|---|---|---|---|
| Plastic timing-chain tensioners (early secondary) | Cold-start rattle; worst case chain failure and valve damage | Confirm 3rd-gen metal tensioners (grey/aluminium body) or retrofit invoice | Specialist secondary tensioner job often ~£250–£500 fitted (UK) [1][2] |
| Nikasil bore coating (engines before ~Aug 2000) | Poor cold start, blow-by, misfire on high-sulphur fuel history | Compression/leakdown; confirm steel-liner replacement engine if early | Engine work not yet verified as a single price [3][4] |
| Water pump (plastic impeller on early pumps) | Overheating; impeller disintegration | Confirm metal-impeller pump in records | Often done with tensioner service; standalone cost not yet verified [3] |
| CATS / suspension electronics and bushings | Uneven damping, warning lights | Scan; inspect bushes | Not yet verified [4] |
Cost figures checked against the sources below in Nov 2026. Bracketed numbers refer to the source list.
Notes
- Post-2000 steel-liner engines remove the Nikasil worry; still verify tensioners.
- XJR rides on CATS adaptive dampers — budget for bushings and damper health.
Before you buy
Use our printable pre-purchase inspection checklist and get a PPI from a marque specialist.
Sources
- Jagaux, X308 timing chain tensioner problems (accessed Nov 2026)
- PistonHeads, X308 XJR tensioners discussion (accessed Nov 2026)
- Classics World, Jaguar XJ X308 buyer's guide (accessed Nov 2026)
- PistonHeads, XJ8/XJR 1997–2003 buyer's advice (accessed Nov 2026)
Last updated 2026-11-05. Costs vary by region and shop.
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