The Jaguar XJ Long (X351 facelift) 3.0d V6 Automatic, produced from 2015 to July 2019, represents a refined iteration of Jaguar’s flagship sedan. This variant, positioned as a mid-to-high range offering within the XJ lineup, combined a potent diesel engine with the luxury and extended wheelbase characteristic of the Long body style. The X351 facelift brought updated styling, enhanced technology, and improved efficiency to the XJ, solidifying its position as a competitor to the BMW 7 Series and Mercedes-Benz S-Class. This particular model was primarily aimed at the North American, European, and Asian markets, offering a blend of performance, comfort, and fuel economy.
Technical Specifications
| Brand | Jaguar |
| Model | XJ |
| Generation | XJ Long (X351 facelift 2015) |
| Type (Engine) | 3.0d V6 (300 Hp) Automatic |
| Start of production | 2015 |
| End of production | July, 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 7 l/100 km (33.6 US mpg, 40.4 UK mpg, 14.3 km/l) |
| Fuel consumption (extra urban) | 5.2 l/100 km (45.2 US mpg, 54.3 UK mpg, 19.2 km/l) |
| Fuel consumption (combined) | 5.7 l/100 km (41.3 US mpg, 49.6 UK mpg, 17.5 km/l) |
| CO2 emissions | 149 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.2 sec |
| Acceleration 0 – 62 mph | 6.2 sec |
| Acceleration 0 – 60 mph | 5.9 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 6.2 kg/Hp, 161.3 Hp/tonne |
| Weight-to-torque ratio | 2.7 kg/Nm, 376.3 Nm/tonne |
| Power | 300 Hp @ 4000 rpm |
| Power per litre | 100.2 Hp/l |
| Torque | 700 Nm @ 2000 rpm (516.29 lb.-ft. @ 2000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | 306DT |
| Engine displacement | 2993 cm3 (182.64 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 90 mm (3.54 in.) |
| Compression ratio | 16.1:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 6.6 l (6.97 US qt | 5.81 UK qt) |
| Coolant | 9.7 l (10.25 US qt | 8.53 UK qt) |
| Kerb Weight | 1860 kg (4100.6 lbs.) |
| Max. weight | 2450 kg (5401.33 lbs.) |
| Max load | 590 kg (1300.73 lbs.) |
| Fuel tank capacity | 77 l (20.34 US gal | 16.94 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 track | 1604 mm (63.15 in.) |
| Minimum turning circle | 12.3 m (40.35 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 8 |
| Gearbox type | Automatic transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
Powertrain & Engine Architecture
The heart of the XJ Long 3.0d is Jaguar’s 306DT engine, a 3.0-liter turbocharged V6 diesel. This engine is part of the AJ-V6 family, but specifically tailored for diesel operation. It utilizes a common-rail direct injection system, delivering fuel at extremely high pressure for optimized combustion. The engine features a single turbocharger with an intercooler, boosting power and torque while managing exhaust gas temperatures. The 306DT produces 300 horsepower at 4000 rpm and a substantial 700 Nm (516 lb-ft) of torque from as low as 2000 rpm. This torque output is a key characteristic, providing strong acceleration and effortless cruising. The engine also incorporates a diesel particulate filter (DPF) to meet stringent Euro 6 emissions standards. The engine is longitudinally mounted in the front of the vehicle. The eight-speed automatic transmission, sourced from ZF, is a crucial component of this powertrain. It provides smooth and responsive gear changes, contributing to both performance and fuel efficiency. The transmission’s wide gear ratios allow the engine to operate in its optimal power band, maximizing both acceleration and economy.
Driving Characteristics
The 3.0d V6 Automatic delivers a refined and comfortable driving experience. The abundant torque allows for brisk acceleration, with 0-60 mph times around 5.9 seconds. While not as overtly sporty as some of its gasoline-powered siblings, the diesel XJ offers ample power for overtaking and highway cruising. The eight-speed automatic transmission is well-tuned, providing seamless shifts and contributing to a relaxed driving experience. Compared to the higher-output Supercharged V6 or V8 models, the 3.0d prioritizes fuel efficiency and low-end torque over outright horsepower. The gear ratios are optimized for maximizing torque delivery, making it a particularly good choice for long-distance journeys. The long wheelbase of the XJ contributes to a smooth and stable ride, further enhancing comfort.
Equipment & Trim Levels
The XJ Long 3.0d Automatic came generously equipped, reflecting its position as a luxury vehicle. Standard features typically 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 Long wheelbase provided significantly more rear legroom than the standard-wheelbase XJ, making it particularly appealing to chauffeur-driven buyers. Optional extras included a rear-seat entertainment system, massaging seats, and upgraded interior trim materials. The trim level could vary depending on the market, but generally offered a range of customization options to tailor the vehicle to individual preferences.
Chassis & Braking
The XJ Long utilizes a lightweight aluminum chassis, contributing to its relatively low weight for a full-size luxury sedan. The suspension system consists of double wishbones at the front and a multi-link setup at the rear, providing a comfortable and controlled ride. The 3.0d variant typically featured ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control were standard safety features. 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 3.0d Automatic was generally well-received by critics, praised for its comfortable ride, refined interior, and fuel-efficient diesel engine. It was often seen as a compelling alternative to the German luxury sedans, offering a unique blend of British style and performance. Compared to the gasoline-powered XJ models, the 3.0d offered significantly better fuel economy, making it a more practical choice for high-mileage drivers. However, some critics noted that the diesel engine lacked the responsiveness and sound of the gasoline engines. In terms of reliability, the 306DT engine proved to be generally robust, although maintenance costs for the diesel particulate filter and other emissions control systems could be higher than for gasoline engines.
Legacy
The Jaguar XJ Long 3.0d Automatic remains a desirable used car today, offering a luxurious and comfortable driving experience at a relatively affordable price point. The 306DT engine has proven to be durable, and with proper maintenance, can provide many years of reliable service. However, potential buyers should be aware of the potential costs associated with maintaining the diesel particulate filter and other emissions control systems. The XJ Long 3.0d represents a sweet spot in the XJ lineup, combining performance, efficiency, and luxury in a stylish and sophisticated package.
