The Jaguar XJ Long (X351 facelift) with the 3.0-liter V6 engine producing 340 horsepower and paired with an all-wheel-drive system and an eight-speed automatic transmission, was a key offering in Jaguar’s flagship sedan lineup from 2015 to 2018. Representing a significant refresh of the XJ series, the X351 facelift aimed to modernize the vehicle’s aesthetics and technology while retaining the luxurious experience Jaguar was known for. This particular variant occupied a sweet spot in the range, offering a compelling blend of performance, refinement, and all-weather capability, positioned above the base 2.0L models but below the higher-performance supercharged V6 and V8 options.
Technical Specifications
| Brand | Jaguar |
| Model | XJ |
| Generation | XJ Long (X351 facelift 2015) |
| Type (Engine) | 3.0 V6 (340 Hp) AWD Automatic |
| Start of production | 2015 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban | 13.6 l/100 km (17.3 US mpg, 20.8 UK mpg, 7.4 km/l) |
| Fuel consumption (economy) – extra urban | 7.6 l/100 km (30.9 US mpg, 37.2 UK mpg, 13.2 km/l) |
| Fuel consumption (economy) – combined | 9.8 l/100 km (24 US mpg, 28.8 UK mpg, 10.2 km/l) |
| CO2 emissions | 234 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.4 sec |
| Acceleration 0 – 62 mph | 6.4 sec |
| Acceleration 0 – 60 mph | 6.1 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.5 kg/Hp, 181.3 Hp/tonne |
| Weight-to-torque ratio | 4.2 kg/Nm, 240 Nm/tonne |
| Power | 340 Hp @ 6500 rpm |
| Power per litre | 113.5 Hp/l |
| Torque | 450 Nm @ 3500-5000 rpm (331.9 lb.-ft. @ 3500-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | 306PS |
| Engine displacement | 2995 cm3 (182.77 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 84.5 mm (3.33 in.) |
| Piston Stroke | 89 mm (3.5 in.) |
| Compression ratio | 10.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Supercharger, Intercooler |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 8.6 l (9.09 US qt | 7.57 UK qt) |
| Kerb Weight | 1875 kg (4133.67 lbs.) |
| Max. weight | 2450 kg (5401.33 lbs.) |
| Max load | 575 kg (1267.66 lbs.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Length | 5255 mm (206.89 in.) |
| Width | 1899 mm (74.76 in.) |
| Width including mirrors | 2105 mm (82.87 in.) |
| Height | 1460 mm (57.48 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 | 12.9 m (42.32 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 8 |
| Gearbox type | automatic transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
Powertrain & Engine Architecture
At the heart of this XJ Long variant lies Jaguar’s 3.0-liter AJ126 supercharged V6 engine. This engine, part of the AJ series, utilizes a roots-type supercharger for forced induction, providing a broad torque curve and responsive acceleration. The engine features direct fuel injection, optimizing combustion efficiency and power output. The 340 horsepower version of this engine employs a slightly different calibration compared to the higher-output 404 hp variant. The engine’s architecture is a 60-degree V6, contributing to its relatively compact size and smooth operation. The eight-speed automatic transmission, sourced from ZF, is a crucial component of the powertrain. Known for its smooth shifts and efficiency, this transmission features a wide gear ratio spread, optimizing both acceleration and fuel economy. The all-wheel-drive system employs a full-time system, distributing torque between the front and rear axles for enhanced traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The 3.0-liter V6 AWD XJ Long delivers a refined and capable driving experience. While not as overtly sporty as the supercharged V6 or V8 models, it provides ample power for comfortable highway cruising and confident overtaking. The supercharger provides immediate throttle response, and the eight-speed transmission ensures the engine is consistently in its optimal power band. The all-wheel-drive system inspires confidence in slippery conditions, providing enhanced grip and stability. Compared to the rear-wheel-drive variants, the AWD model offers a more secure feel, especially during inclement weather. The automatic transmission is programmed for smooth, almost imperceptible shifts in normal driving mode, but can be manually shifted using paddle shifters for a more engaging experience. The long wheelbase contributes to a comfortable ride, absorbing bumps and imperfections in the road surface effectively.
Equipment & Trim Levels
The XJ Long 3.0 V6 AWD typically came well-equipped, reflecting its position as a luxury vehicle. Standard features included leather upholstery, heated and ventilated front seats, a premium sound system, a touchscreen infotainment system with navigation, and a comprehensive suite of safety features. The XJ Long, by definition, offered extended rear legroom compared to the standard wheelbase XJ. Optional extras included upgraded leather trims, rear-seat entertainment systems, massaging seats, and advanced driver-assistance systems such as adaptive cruise control and blind-spot monitoring. Trim levels varied slightly by market, but generally offered increasing levels of luxury and technology.
Chassis & Braking
The XJ Long’s chassis is constructed primarily of aluminum, contributing to its relatively lightweight construction despite its size. The suspension system utilizes double wishbones at the front and a multi-link setup at the rear, providing a comfortable and controlled ride. The 3.0 V6 AWD models were equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) were standard features, enhancing safety and control. The steering system is an electric power-assisted rack and pinion system, offering precise and responsive steering feel.
Market Reception & Comparison
The Jaguar XJ Long 3.0 V6 AWD was generally well-received by automotive critics. It was praised for its luxurious interior, comfortable ride, and refined powertrain. The all-wheel-drive system was seen as a valuable addition, particularly in regions with harsh winters. Compared to the higher-output supercharged models, the 3.0 V6 offered a more balanced combination of performance and fuel economy. Fuel economy figures of around 24 mpg combined were respectable for a large luxury sedan. Reliability was generally good, although some owners reported minor issues with the infotainment system. Compared to rivals such as the BMW 7 Series and Mercedes-Benz S-Class, the XJ Long offered a unique blend of British style and luxury.
Legacy
The Jaguar XJ Long 3.0 V6 AWD remains a desirable used car today, offering a compelling combination of luxury, performance, and all-weather capability. The 3.0-liter supercharged V6 engine has proven to be relatively reliable, provided it has been properly maintained. The ZF eight-speed automatic transmission is also known for its durability. While maintenance costs can be higher than for more mainstream brands, the XJ Long offers a unique driving experience and a level of luxury that few other vehicles can match. The X351 facelift represents a high point in Jaguar’s modern history, and this particular variant continues to appeal to buyers seeking a sophisticated and capable luxury sedan.
