In 1959 Jaguar launched a new range of compact saloons collectively known as the "Mk II" family. In the middle of the new range was the Mk II 3.4 litre which featured the 3442cc XK engine, as used in the previous 3.4 Saloon, which was now referred to as the Mk I. The 3.4 litre had excellent performance (120mph max speed) although due its extra weight the Mk II was not quite as fast as the previous model.
As with the rest of the range the 3.4 received the better looking body revisions. The new car had slimmer window surrounds, a larger glass area, new front and rear lamps, a deeper grille and a revised interior. The interior was well appointed and standard equipment included leather upholstery, fold down picnic trays for rear passengers, a wood dash and door cappings.
Production of the Mk II 3.4 ended in 1967, although a renamed, cheaper version, the 340, continued to sell until 1969.