2015-2018 Jaguar XJ Long (X351 facelift ) 5.0 V8 (470 Hp) Automatic

The Jaguar XJ Long (X351 facelift) 5.0 V8 Automatic, produced from 2015 to 2018, represents the pinnacle of luxury and performance within the XJ range during that period. This extended-wheelbase variant of the XJ, part of the X351 generation introduced in 2009 and facelifted in 2015, was specifically designed to cater to buyers prioritizing rear passenger space and a supremely comfortable ride. The 5.0 V8 engine, producing 470 horsepower, positioned this model as the flagship offering, blending British elegance with potent acceleration. It primarily targeted the luxury sedan market in North America, Europe, and Asia, competing with vehicles like the BMW 7 Series, Mercedes-Benz S-Class, and Audi A8.

Technical Specifications

Powertrain & Engine Architecture

At the heart of the XJ Long 5.0 V8 lies Jaguar’s AJ126 engine, a 5.0-liter supercharged V8. This engine, a descendant of the Ford-derived Jaguar V8s, underwent significant development under Jaguar Land Rover ownership. The 508PS variant, as designated by the engine code, utilizes a Roots-type supercharger with an intercooler to deliver increased air density and boost. Direct fuel injection, combined with a dual overhead camshaft (DOHC) valvetrain and four valves per cylinder, optimizes combustion efficiency and power output. The engine’s architecture is longitudinal, meaning it’s mounted lengthwise in the chassis, driving the rear wheels. The eight-speed automatic transmission, sourced from ZF, is a crucial component, providing smooth and responsive gear changes. This transmission features a wide gear ratio spread, contributing to both performance and fuel efficiency.

Driving Characteristics

The 470 horsepower and 424 lb-ft of torque delivered by the 5.0 V8, coupled with the eight-speed automatic, result in exhilarating performance. Acceleration from 0-60 mph is achieved in approximately 4.9 seconds, making it a genuinely quick luxury sedan. The automatic transmission is programmed for a balance of comfort and responsiveness, offering manual shift control via paddle shifters for a more engaging driving experience. While the supercharger provides instant torque, the car’s substantial weight (approximately 4,156 lbs) is noticeable, particularly during spirited driving. Compared to the standard wheelbase XJ or lower-powered variants, the 5.0 V8 offers a significantly more potent driving experience. The longer wheelbase of the Long variant contributes to a more composed ride, especially on uneven surfaces, but slightly diminishes agility compared to the standard XJ.

Equipment & Trim Levels

The XJ Long 5.0 V8 Automatic came generously equipped as standard. Interior appointments included premium leather upholstery, wood veneer trim, and a comprehensive infotainment system with a touchscreen display. Standard features also encompassed a panoramic sunroof, heated and ventilated front seats with massage function, a rear seat entertainment system (often with dual screens), and a premium audio system. Optional extras included upgraded leather packages, bespoke interior trim options, and advanced driver-assistance systems such as adaptive cruise control, blind-spot monitoring, and a 360-degree camera system. The XJ Long was positioned as the top-of-the-line trim, offering the highest level of luxury and technology within the XJ range.

Chassis & Braking

The XJ Long utilizes a lightweight aluminum chassis, a hallmark of the X351 generation, contributing to its relatively low weight for a full-size luxury sedan. Suspension consists of double wishbones at both the front and rear, with adaptive dampers that adjust to road conditions and driving style. The braking system features ventilated discs on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard safety features. The Long wheelbase and sophisticated suspension setup prioritize ride comfort, delivering a smooth and refined driving experience.

Market Reception & Comparison

Critics generally praised the XJ Long 5.0 V8 for its powerful engine, luxurious interior, and comfortable ride. However, some reviewers noted that its fuel economy (around 21 mpg combined) was relatively poor compared to some of its competitors. Reliability was generally good, although the complexity of the engine and its associated systems meant that maintenance costs could be higher than for simpler vehicles. Compared to the XJ 3.0L V6 models, the 5.0 V8 offered significantly more performance but at a higher price point and with increased running costs. Against rivals like the BMW 750i and Mercedes-Benz S550, the XJ Long offered a unique blend of British style and performance, often appealing to buyers seeking an alternative to the German dominance in the luxury sedan segment.

Legacy

The Jaguar XJ Long 5.0 V8 Automatic remains a desirable used car, appreciated for its combination of luxury, performance, and distinctive styling. The supercharged V8 engine is generally considered robust, although regular maintenance is crucial to ensure its longevity. While parts availability is generally good, specialized repairs can be expensive. The X351 generation XJ, and particularly the Long wheelbase variants, represent a high point in Jaguar’s modern history, showcasing the brand’s commitment to luxury and engineering excellence. Today, these vehicles are sought after by enthusiasts and collectors who appreciate their unique character and refined driving experience.