Jaguar XJ (X300 & X308) Engine —3.2, 4.0 & Supercharged AJ-V8 Supply, Rebuild & Fit Across the UK
The Jaguar XJ (X300 and X308 generations) represents a high point for the classic Jaguar saloon. Elegant, refined, and possessed of a grace that few modern cars can emulate — they are vehicles that demand preservation. From the AJ16 straight-six in the X300 to the AJ-V8 in the X308, these engines provide the soul of the XJ experience.
At Vogue Technics in Grays, UK, we specialise in Jaguar XJ restoration and engine rebuilds across these iconic generations. we serve XJ6, XJ8, and XJR owners across Grays, West Thurrock, London, Essex, Kent, Surrey, and the wider UK — delivering the specialist knowledge required to keep these heritage saloons in peak mechanical condition.
Whether you own an AJ16-powered X300 requiring a head gasket refresh or an X308 V8 facing timing tensioner failure — we provide the honest assessments and precision engineering your XJ deserves.
Jaguar XJ (X300/X308) Engine — Specialist Rebuild & Heritage Reconditioning
Reconditioning heritage Jaguar engines is a path we understand deeply. We focus on preserving the original character of the XJ while rectifying the known failure points of both the straight-six and V8 platforms.
AJ16 Straight-Six (X300) — Bulletproof Heritage Rebuilds
The AJ16 is one of Jaguar's most robust units. We handle the delicate restoration of these straight-sixes, addressing head gasket integrity and exhaust manifold issues that can develop over high mileages.
XJ Heritage Hub
- Jaguar X300 XJ6 3.2 & 4.0 AJ16 Full Support
- X300 XJR Supercharged AJ16S Reconditioning
- Jaguar X308 XJ8 3.2 & 4.0 AJ-V8 Specialists
- X308 XJR Supercharged V8 Performance Rebuilds
- Straight-Six & V8 Supply & Fit Across the UK
Common XJ (X300/X308) Engine Faults — What We Rectify
Jaguar XJ problems across these two generations are well understood by our specialists. We identify and solve these faults correctly before they lead to starting issues or engine damage.
Heritage XJ Specialist
Specialist diagnostics and repair for all classic XJ variants.
- AJ16 (X300) rocker cover and head gasket oil leaks
- Throttle body and idling issues on the X300 AJ16
- Nikasil cylinder liner wear and starting faults (Early X308)
- Plastic timing chain tensioner failure on AJ-V8 (X308)
- Valley hose leaks leading to AJ-V8 overheating
- Supercharger rattle and performance loss on XJR models
Emergency Heritage Hub
Heritage diagnostics and engine fitting in Grays RM20.
Same-Day Heritage XJ Diagnosis
Identify your XJ's mechanical fault today.
Secure Nationwide Delivery
X300 and X308 engines delivered to your door.
Heritage Warranty
Full written protection on all XJ rebuilds.
Why Jaguar XJ Owners Across the UK
Trust Vogue Technics in Grays
Jaguar X300 & X308 Specialists
We have a long history with the AJ16 and AJ-V8 platforms, understanding the specific tolerances and generational differences of the classic XJ.
Own Heritage Engine Stock
We maintain our own stock of tested used and reconditioned XJ engines, meaning you receive prompt support without third-party delays.
Accountable Heritage Work
You receive a technical breakdown and an honest, itemised quote before any work commences on your modern classic Jaguar.
Jaguar XJ (X300 & X308 generations) Engine Codes to Help You Find Your Vehicle
| Make | Model | Engine Code | Valves | Actual CC | Power Kw / Hp | Year Range | |
|---|---|---|---|---|---|---|---|
| Jaguar | XJ6 (X300) | AJ16 | - | 3239 | 155 kW / 211 hp | 1994–1997 | Get Quote |
| Jaguar | XJ6 (X300) | AJ16 | - | 3980 | 183 kW / 249 hp | 1994–1997 | Get Quote |
| Jaguar | XJR (X300) | AJ16S | - | 3980 | 240 kW / 326 hp | 1994–1997 | Get Quote |
| Jaguar | XJ8 (X308) | AJ26 | - | 3996 | 216 kW / 290 hp | 1997–1999 | Get Quote |
| Jaguar | XJ8 (X308) | AJ27 | - | 3996 | 216 kW / 290 hp | 1999–2002 | Get Quote |
| Jaguar | XJR (X308) | AJ26S | - | 3996 | 272 kW / 370 hp | 1997–1999 | Get Quote |
| Jaguar | XJR (X308) | AJ27S | - | 3996 | 276 kW / 375 hp | 1999–2003 | Get Quote |
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FREQUENTLY ASKED QUESTIONS — JAGUAR XJ (X300/X308) ENGINES
Find answers to common questions about our engine rebuilds and replacements in Grays England.
The Jaguar XJ (X300/X308) is a classic saloon that deserves a specialist heritage rebuild.
At Vogue Technics in Grays, that is precisely what we deliver. Call our specialist team today or submit an online enquiry for an honest, transparent quote and 24-hour diagnostic slot.
Find Your Jaguar Engine
Select your model below to view specific engine codes, technical specifications and fitting details for your vehicle.
XK8 Engines
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XKR Engines
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XKR-S Engines
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XJ (X350 / X358) Engines
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XJ (X351) Engines
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F-TYPE V6 Engines
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F-TYPE V8 Engines
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F-TYPE SVR / R Engines
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F-PACE Engines
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E-PACE Engines
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XE Engines
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