The Jaguar XJ6, the use of 2.eight litre (2790 cc/one hundred seventy in³) and 4.2 litre (4235 cc/258 in³) straight-six cylinder variations of Jaguar's famend XK engine, changed maximum of Jaguar's saloons - which, withinside the 1960s, had improved to 4 separate ranges. Apart from the engines, the opposite foremost element carried over from preceding fashions become the widest model of Jaguar's IRS unit from the Mark X.
An upmarket model become advertised beneathneath the Daimler emblem and known as the Daimler Sovereign, persevering with the call from the Daimler model of the Jaguar 420.
The vehicle become delivered in September 1968. Power assisted guidance and leather-based upholstery have been trendy at the 2.eight L 'De Luxe' and 4.2 L fashions and air con become supplied as an optionally available greater at the 4.2 L. Daimler variations have been released in October 1969, in a sequence of tv classified ads presenting Sir William. In those spots, he noted the automobile as "the greatest Jaguar ever". An uncommon feature, inherited from the Jaguar Mark X, become the availability of dual gas tanks, placed on every aspect of the boot / trunk, and crammed the use of one after the other lockable filler caps: one at the pinnacle of every wing above the rear wheel arches.
In March 1970 it become introduced that the Borg-Warner Model eight computerized transmission which the Jaguar XJ6 had featured seeing that 1968 might get replaced at the 4.2 litre engined Jaguar XJ6 with a Borg-Warner Model 12 unit. The new transmission now had 3 distinct ahead positions accessed thru the selector lever, which efficiently enabled overall performance orientated drivers to keep decrease ratios at better revs with a view to obtain higher acceleration. "Greatly stepped forward shift quality" become additionally claimed for the brand new system.
In 1972 the choice of a protracted wheel base model, presenting a modest growth in leg room for passengers withinside the back, have become available.