The Jaguar XJ Long (X351) 5.0 V8 385 hp Automatic, produced between 2009 and 2012, represented a significant evolution in Jaguar’s flagship sedan. Part of the third generation (X351) XJ series, the “Long” wheelbase variant offered increased rear passenger space, targeting a luxury market segment prioritizing comfort and prestige. This particular configuration, pairing the naturally aspirated 5.0-liter V8 engine with a six-speed automatic transmission, positioned itself as a mid-to-upper range offering within the XJ lineup, bridging the gap between the standard wheelbase models and the higher-performance Supercharged variants. The X351 generation marked a departure from the traditional Jaguar design language, embracing a more modern and streamlined aesthetic while retaining the brand’s commitment to luxury and driving refinement.
Technical Specifications
| Brand | Jaguar |
| Model | XJ |
| Generation | XJ Long (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, 217 Hp/tonne |
| Weight-to-torque ratio | 3.4 kg/Nm, 290.3 Nm/tonne |
| Power | 385 Hp @ 6500 rpm |
| Power per litre | 77 Hp/l |
| Torque | 515 Nm @ 3500 rpm (379.84 lb.-ft. @ 3500 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 | 1774 kg (3911 lbs.) |
| Max. weight | 2335 kg (5147.79 lbs.) |
| Max load | 561 kg (1236.79 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 | 5252 mm (206.77 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 | 3157 mm (124.29 in.) |
| Front track | 1626 mm (64.02 in.) |
| Rear (Back) track | 1604 mm (63.15 in.) |
| Minimum turning circle (turning diameter) | 12.3 m (40.35 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 Long 5.0 V8 was Jaguar’s 508PN engine, a 5.0-liter naturally aspirated V8. This engine utilized direct fuel injection, a key technology for improving both power and fuel efficiency. The engine featured a double overhead camshaft (DOHC) valvetrain with four valves per cylinder, optimizing airflow for enhanced performance. The 5.0-liter V8 produced 385 horsepower at 6,500 rpm and 515 Nm (379.84 lb-ft) of torque at 3,500 rpm. The engine’s architecture was a 90-degree V configuration, contributing to a smooth and balanced power delivery. Paired with this engine was a ZF 6HP26 six-speed automatic transmission. This transmission was known for its smooth shifting characteristics and responsiveness, although it lacked the efficiency of more modern eight or nine-speed automatics. The transmission was electronically controlled, adapting shift points based on driving conditions and throttle input.
Driving Characteristics
The 5.0-liter V8 and six-speed automatic combination in the XJ Long delivered a refined and comfortable driving experience. While not as overtly sporty as the Supercharged models, the 385 hp engine provided ample power for effortless cruising and confident overtaking. Acceleration from 0-60 mph took approximately 5.4 seconds. The automatic transmission, while smooth, could feel slightly hesitant at times, particularly during quick downshifts. The gear ratios were tuned for comfort and fuel economy rather than outright performance. Compared to the manual transmission options available on some XJ models, the automatic prioritized ease of use over driver engagement. The long wheelbase contributed to a stable and composed ride, absorbing bumps and imperfections in the road with aplomb.
Equipment & Trim Levels
The XJ Long 5.0 V8 typically came well-equipped as standard. Interior features included leather upholstery, wood veneer trim, and a premium audio system. Standard safety features included ABS, traction control, and multiple airbags. Optional extras included a rear seat entertainment system, massaging seats, and upgraded leather options. The XJ Long trim level itself focused on rear passenger comfort, offering increased legroom and dedicated climate control settings for the rear occupants. The dashboard layout was characterized by a blend of traditional analog gauges and a modern infotainment screen.
Chassis & Braking
The XJ Long utilized an aluminum monocoque chassis, contributing to its relatively lightweight construction. The front suspension featured a double wishbone setup with coil springs and a transverse stabilizer bar, while the rear suspension employed an independent multi-link system with air suspension and a transverse stabilizer bar. The air suspension provided adjustable ride height and damping, further enhancing ride comfort. Braking duties were handled by ventilated discs on all four wheels, with larger discs at the front (355mm) compared to the rear (326mm). ABS was standard, providing enhanced braking control in emergency situations.
Market Reception & Comparison
The XJ Long 5.0 V8 was generally well-received by automotive critics. It was praised for its luxurious interior, comfortable ride, and refined powertrain. However, some critics noted that the fuel economy was relatively poor compared to its competitors, and the six-speed automatic transmission felt dated. Compared to the XJ Supercharged models, the 5.0 V8 offered a more balanced blend of performance and fuel efficiency, appealing to buyers who prioritized comfort over outright speed. Against rivals like the BMW 7 Series and Mercedes-Benz S-Class, the XJ Long offered a distinctive British character and a focus on rear passenger comfort.
Legacy
The Jaguar XJ Long 5.0 V8 (X351) remains a desirable luxury sedan in the used car market. The 5.0-liter V8 engine is generally considered reliable, although regular maintenance is essential. Common issues include oil leaks and occasional problems with the air suspension system. The ZF six-speed automatic transmission is also generally robust, but may require servicing at higher mileages. The X351 generation XJ represented a bold step forward for Jaguar, and the 5.0 V8 variant continues to offer a compelling combination of luxury, performance, and British charm.
