The Jaguar XJ X308, produced between 1997 and 2003, represented a significant evolution of Jaguar’s flagship sedan. Replacing the XJ40 (X300), the X308 was the first XJ to feature a fully unitized body structure, enhancing rigidity and refinement. This generation aimed to blend traditional Jaguar luxury with modern engineering, offering a more contemporary driving experience. The 4.0-liter V8 model, equipped with an automatic transmission, occupied a premium position within the X308 lineup, offering a substantial step up in performance and refinement compared to the inline-six cylinder options.
Technical Specifications
| Brand | Jaguar |
| Model | XJ |
| Generation | XJ (X308) |
| Type (Engine) | 4.0 V8 32V (284 Hp) Automatic |
| Start of production | 1997 |
| End of production | 2003 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban | 17.2 l/100 km (13.7 US mpg, 16.4 UK mpg, 5.8 km/l) |
| Fuel consumption (economy) – extra urban | 8.9 l/100 km (26.4 US mpg, 31.7 UK mpg, 11.2 km/l) |
| Fuel consumption (economy) – combined | 12 l/100 km (19.6 US mpg, 23.5 UK mpg, 8.3 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.3 sec |
| Acceleration 0 – 62 mph | 7.3 sec |
| Acceleration 0 – 60 mph | 6.9 sec |
| Maximum speed | 240 km/h (149.13 mph) |
| Weight-to-power ratio | 6.3 kg/Hp, 159.6 Hp/tonne |
| Weight-to-torque ratio | 4.7 kg/Nm, 210.7 Nm/tonne |
| Power | 284 Hp @ 6100 rpm |
| Power per litre | 71.1 Hp/l |
| Torque | 375 Nm @ 4250 rpm (276.59 lb.-ft. @ 4250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | AJ26, AJ27 |
| Engine displacement | 3996 cm3 (243.85 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 86 mm (3.39 in.) |
| Piston Stroke | 86 mm (3.39 in.) |
| Compression ratio | 10.7:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 10 l (10.57 US qt | 8.8 UK qt) |
| Kerb Weight | 1780 kg (3924.23 lbs.) |
| Max. weight | 2260 kg (4982.45 lbs.) |
| Max load | 480 kg (1058.22 lbs.) |
| Trunk (boot) space – minimum | 430 l (15.19 cu. ft.) |
| Fuel tank capacity | 81 l (21.4 US gal | 17.82 UK gal) |
| Length | 5023 mm (197.76 in.) |
| Width | 1799 mm (70.83 in.) |
| Height | 1345 mm (52.95 in.) |
| Wheelbase | 2870 mm (112.99 in.) |
| Front track | 1500 mm (59.06 in.) |
| Rear (Back) track | 1498 mm (58.98 in.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 5 gears, automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Double wishbone |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 235/50 R17 |
INTRODUCTION
The Jaguar XJ X308 4.0 V8 Automatic, produced from 1997 to 2003, represented the pinnacle of luxury and performance within the X308 range. Positioned as the flagship model, it catered to buyers seeking a refined and powerful grand tourer. Built on the X308 platform (derived from the XJ40/X300), it benefited from significant advancements in body construction and engine technology. The automatic transmission was a key feature, designed to provide smooth and effortless cruising, appealing to a clientele prioritizing comfort over outright driver engagement.
Powertrain & Engine Architecture
At the heart of the XJ X308 4.0 V8 lay the AJ26/AJ27 engine, a naturally aspirated 4.0-liter V8. This engine, a descendant of the earlier Jaguar V12 designs, featured a 60-degree V-angle and a DOHC (Dual Overhead Camshaft) valvetrain with four valves per cylinder. The engine utilized a multi-port fuel injection system, delivering fuel directly into the intake ports. The AJ26/AJ27 was known for its smooth power delivery and characteristic Jaguar V8 sound. The 5-speed automatic transmission, a ZF 5HP24 unit, was specifically chosen for its smoothness and reliability. This transmission featured electronic control and adaptive shift programming, adjusting shift points based on driving style and conditions. The transmission’s torque converter lock-up function further enhanced fuel efficiency at cruising speeds.
Driving Characteristics
The 4.0 V8 Automatic XJ X308 offered a distinctly different driving experience compared to the inline-six or supercharged V8 variants. While not as overtly sporty as the supercharged models, the 284 horsepower and 375 lb-ft of torque provided ample power for effortless acceleration and confident highway cruising. The automatic transmission, while smooth, did result in a slight reduction in responsiveness compared to the manual transmission options available in other markets. Gear ratios were tuned for comfort and refinement, prioritizing smooth transitions over aggressive downshifts. The 0-60 mph time of around 6.9 seconds was respectable for a luxury sedan of its size and weight. The focus was on providing a relaxed and refined driving experience, making it an ideal choice for long-distance travel.
Equipment & Trim Levels
The 4.0 V8 Automatic XJ X308 typically came well-equipped, reflecting its premium positioning. Standard features included leather upholstery, wood veneer trim, automatic climate control, power-adjustable front seats with memory function, and a premium sound system. Optional extras included a rear seat entertainment system, upgraded leather options, and a sunroof. Trim levels varied slightly depending on the market, but generally, the 4.0 V8 represented the highest level of standard equipment. The interior design emphasized luxury and comfort, with a focus on high-quality materials and craftsmanship.
Chassis & Braking
The X308’s fully unitized body structure provided a solid foundation for its independent suspension system. Both front and rear suspensions utilized a double wishbone configuration, offering a comfortable ride and good handling characteristics. The 4.0 V8 models were equipped with ventilated disc brakes on all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) was standard, enhancing safety and control during emergency braking situations. The steering system employed a rack-and-pinion setup with hydraulic power assistance, offering precise and responsive steering feel. The suspension was tuned to prioritize ride comfort, resulting in a smooth and controlled driving experience.
Market Reception & Comparison
The XJ X308 4.0 V8 Automatic was generally well-received by automotive critics. It was praised for its luxurious interior, smooth ride, and powerful engine. However, some critics noted that the automatic transmission could feel slightly sluggish compared to manual options. Compared to the inline-six models, the 4.0 V8 offered a significant performance upgrade, but at a higher price point. Fuel economy was a concern for some, with combined fuel consumption averaging around 19.6 US mpg. Compared to rivals like the BMW 7 Series and Mercedes-Benz S-Class, the XJ X308 offered a unique blend of British luxury and sporting character.
Legacy
The Jaguar XJ X308 4.0 V8 Automatic has proven to be a relatively reliable classic in the used car market. The ZF 5HP24 automatic transmission is known for its durability, and the AJ26/AJ27 V8 engine, while requiring regular maintenance, is generally robust. Common issues include minor electrical gremlins and wear and tear on suspension components. Today, the X308 4.0 V8 is appreciated by enthusiasts for its classic Jaguar styling, luxurious interior, and smooth driving experience. It represents a sweet spot in the XJ lineage, offering a blend of modern technology and traditional British charm. Well-maintained examples are becoming increasingly collectible, appealing to those seeking a refined and elegant grand tourer.
