The intended replacement for the Series XJ was code named XJ40. Development on the all-new car began in the early 1970s, and it was introduced in 1986 at the British International Motor Show. With the XJ40, Jaguar began to place more emphasis on build quality as well as simplification of the XJ's build process. The new platform came with significantly different styling, which was more squared-off and angular than the outgoing Series III. Individual round headlamps were replaced with rectangular units on the higher-specification cars, and all models came with only a single, wide-sweeping windshield wiper. The interior received several modernisations such as the switch to a digital instrument cluster, although this was eventually discontinued in 1990. The six-cylinder XJ40s are powered by the AJ6 inline-six engine, which replaced the XK6 unit used in earlier XJs. The new unit featured a four-valve, twin overhead cam design. In 1993, one year before XJ40 production ended, the V12-powered XJ12 and Daimler Double Six models were reintroduced.
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