What year was the last xj6 series 3 4.2 liter produced?

The last Jaguar XJ6 Series 3 4.2 liter was produced in 1987. This model was part of the XJ series that began in the early 1970s, with the Series 3 being introduced in 1979. The XJ6 Series 3 marked the end of the classic XJ6 design before the transition to the newer XJ models.