Hi Paul,

These instructions are for the 2008-2017 Insignia 2.0 CDTi:

- Turn on the ignition

- Press the 'MENU' button on the indicator stalk until 'Vehicle information menu' is displayed in the dash

- Turn the ridged section of the end of the indicator stalk to go through the menu options to 'remaining oil life'

- Now press and hold the button on the end of the indicator stalk while simultaneously pressing and holding the brake pedal down for a few seconds

- Release them both and then turn off the ignition

That should do it. If any queries about it, it's best to bring the car to a good mechanic to have a look at it.