In 1972, following the success of the S1 Straight 6, Jaguar launched the 5.3 litre V12 and it was the only production 4 door saloon V12 engine car at the time. With a top speed of around 140 mph, 3,235 Series 1 XJ12’s were built. To see the range of parts that we supply for your XJ12 S1 browse our collection below.