The Jaguar XJ X351, produced from 2009 to 2012, represented a significant evolution for Jaguar’s flagship sedan. The 5.0 V8 variant, generating 385 horsepower and paired with a six-speed automatic transmission, occupied a key position in the XJ lineup, offering a balance of performance, luxury, and refinement. This model aimed to compete directly with established German rivals like the BMW 7 Series and Mercedes-Benz S-Class, offering a distinctly British alternative. The X351 generation marked a departure from the previous XJ’s styling, adopting a more contemporary and sculpted design, while retaining the model’s core values of comfort and prestige.
Technical Specifications
| Brand | Jaguar |
| Model | XJ |
| Generation | XJ (X351) |
| Type (Engine) | 5.0 V8 (385 Hp) Automatic 6-speed |
| Start of production | 2009 |
| End of production | 2012 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban (NEDC) | 17 l/100 km (13.8 US mpg, 16.6 UK mpg, 5.9 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 8.2 l/100 km (28.7 US mpg, 34.4 UK mpg, 12.2 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 11.3 l/100 km (20.8 US mpg, 25 UK mpg, 8.8 km/l) |
| CO2 emissions (NEDC) | 264 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.7 sec |
| Acceleration 0 – 62 mph | 5.7 sec |
| Acceleration 0 – 60 mph | 5.4 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 4.6 kg/Hp, 219.4 Hp/tonne |
| Weight-to-torque ratio | 3.4 kg/Nm, 293.4 Nm/tonne |
| Power | 385 Hp @ 6500 rpm |
| Power per litre | 77 Hp/l |
| Torque | 515 Nm @ 6500 rpm (379.84 lb.-ft. @ 6500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | 508PN |
| Engine displacement | 5000 cm3 (305.12 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 92.5 mm (3.64 in.) |
| Piston Stroke | 93 mm (3.66 in.) |
| Compression ratio | 11.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 7.25 l (7.66 US qt | 6.38 UK qt) |
| Coolant | 7.5 l (7.93 US qt | 6.6 UK qt) |
| Kerb Weight | 1755 kg (3869.11 lbs.) |
| Max. weight | 2300 kg (5070.63 lbs.) |
| Max load | 545 kg (1201.52 lbs.) |
| Trunk (boot) space – minimum | 520 l (18.36 cu. ft.) |
| Fuel tank capacity | 82 l (21.66 US gal | 18.04 UK gal) |
| Length | 5127 mm (201.85 in.) |
| Width | 1894 mm (74.57 in.) |
| Width with mirrors folded | 1950 mm (76.77 in.) |
| Width including mirrors | 2105 mm (82.87 in.) |
| Height | 1457 mm (57.36 in.) |
| Wheelbase | 3032 mm (119.37 in.) |
| Front track | 1626 mm (64.02 in.) |
| Rear (Back) track | 1604 mm (63.15 in.) |
| Minimum turning circle (turning diameter) | 11.9 m (39.04 ft.) |
| 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 | 6 gears, automatic transmission |
| Front suspension | Coil spring, Double wishbone, Transverse stabilizer |
| Rear suspension | Independent multi-link suspension, Air suspension, Transverse stabilizer |
| Front brakes | Ventilated discs, 355 mm |
| Rear brakes | Ventilated discs, 326 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | Front wheel tires: 245/45 R19; 245/40 R20Rear wheel tires: 275/40 R19; 275/35 R20 |
| Wheel rims size | Front wheel rims: 9J x 19; 9J x 20Rear wheel rims: 10J x 19; 10J x 20 |
Powertrain & Engine Architecture
At the heart of the XJ 5.0 V8 was Jaguar’s naturally aspirated 5.0-liter AJ-V8 engine, designated 508PN. This engine, a descendant of the Ford-derived AJ series, featured a 90-degree V-angle and all-aluminum construction. Direct fuel injection was employed, enhancing both power and fuel efficiency. The engine utilized a double overhead camshaft (DOHC) valvetrain with four valves per cylinder, optimizing breathing and contributing to its high-revving nature. The six-speed automatic transmission, sourced from ZF, was a crucial component, providing smooth and responsive gear changes. This transmission was known for its adaptability and contributed significantly to the XJ’s refined driving experience. The engine’s architecture prioritized smoothness and refinement over outright aggression, aligning with Jaguar’s traditional focus on luxurious grand touring.
Driving Characteristics
The 5.0 V8 with the six-speed automatic delivered a compelling driving experience. Acceleration from 0-60 mph took approximately 5.4 seconds, making it a genuinely quick sedan for its time. While not as overtly sporty as some of its German competitors, the XJ offered a refined and effortless surge of power. The automatic transmission was programmed for comfort, with smooth upshifts and downshifts. Compared to the supercharged 5.0 V8 variants, this naturally aspirated version offered a more linear power delivery, making it easier to modulate in everyday driving. The gear ratios were tuned for a balance of acceleration and cruising efficiency. The rear-wheel-drive configuration contributed to a balanced chassis, although it lacked the all-weather capability of some competitors.
Equipment & Trim Levels
The 5.0 V8 model typically came standard with a high level of equipment. Leather upholstery was standard, along with wood veneer trim and a premium audio system. Features like heated and ventilated front seats, a sunroof, and automatic climate control were also common. Optional extras included a rear-seat entertainment system, upgraded leather options, and various driver-assistance technologies. The XJ offered a range of customization options, allowing buyers to tailor the interior to their preferences. The trim level sat comfortably in the mid-range of the XJ lineup, offering a significant step up in performance and luxury compared to the base models, but without the ultimate extravagance of the supercharged variants.
Chassis & Braking
The XJ X351 utilized an aluminum monocoque chassis, contributing to its relatively low weight for a full-size luxury sedan. The front suspension featured a double wishbone configuration with coil springs and a transverse stabilizer bar. The rear suspension employed an independent multi-link setup with air suspension and a transverse stabilizer bar, providing a comfortable and controlled ride. Braking duties were handled by ventilated discs on all four wheels, with ABS (Anti-lock Braking System) as standard. Front brake rotors measured 355mm, while rear rotors were 326mm. The suspension tuning prioritized ride comfort and isolation from road imperfections, while still providing adequate handling performance.
Market Reception & Comparison
Critics generally praised the XJ 5.0 V8 for its refined engine, comfortable ride, and luxurious interior. However, some reviewers noted that it lacked the outright sporting character of its rivals. Fuel economy, at 20.8 US mpg combined, was considered average for the segment. Compared to the supercharged XJ models, the 5.0 V8 offered a more affordable entry point into the XJ range, while still providing a substantial level of performance and luxury. The 3.0-liter diesel variants offered superior fuel economy, but lacked the V8’s smooth power delivery. Reliability was generally good, although some owners reported minor electrical issues.
Legacy
The Jaguar XJ X351 5.0 V8 remains a desirable used car today, appreciated for its blend of luxury, performance, and British character. The naturally aspirated 5.0-liter V8 engine is known for its durability and relatively straightforward maintenance. While not as technologically advanced as some modern luxury sedans, the X351 offers a timeless elegance and a rewarding driving experience. The ZF six-speed automatic transmission has proven to be reliable, and parts availability is generally good. The X351 represents a high point in Jaguar’s design and engineering, and continues to be a popular choice for enthusiasts seeking a sophisticated and refined luxury sedan.
