Jaguar XJ (X350)

The Jaguar XJ (X350) is a full-size four-door luxury saloon car manufactured and marketed worldwide by Jaguar Cars for model years 2003–2009 as the third generation of the Jaguar XJ saloon, carrying the internal designation X350 and the internal designation X358 following its 2007 intermediate facelift. Both the X350 and X358 were available with a six-speed automatic transmission, a range of petrol and diesel engines (V6, V8, and supercharged V8), numerous trim levels, and short wheelbase (2003–2009) or long wheelbase (2005–2009) car body configurations. Extended-length models were the longest vehicles Jaguar had manufactured.

The X350 was noted for its advanced electrical systems, self-leveling, adaptive air suspension, and full aluminium unibody chassis and bodywork, among the first for a mass-produced automobile. The bodyshell (body in white) was 40 per cent lighter and 50 percent stiffer than its predecessor, despite its increased overall size. Styling of the third generation was a conservative evolution of the previous XJ's styling, and its slatted grille recalled that of the original 1968 XJ Series I. Exterior styling was by principal designer Tom Owen, along with Sandy Boyes, under the design directorship of Geoff Lawson, who died midway through the project, and his successor Ian Callum. The XJ's interior was styled by Giles Taylor.

Manufacturing took place at Jaguar's Browns Lane plant in Coventry, and was the final Jaguar to be produced there before moving to the Castle Bromwich Assembly plant in Birmingham in July 2005. With an unpainted and highly polished example of its all-alloy body shell on display, the X350 debuted at the 2002 Paris Motor Show. The full X350/358 generation largely coincided with Jaguar's ownership by Ford's Premier Automotive Group until Tata Motors purchased Jaguar in 2008. Production ended in March 2009 after seven years, with a total production of 83,566. While it was generally well received and profitable, sales were less than Jaguar had expected. It was followed by the XJ X351.