Opel INSIGNIA Owner's Manual page 22

20 In brief
Activate the anti-theft alarm system
3 34.
■ The engine cooling fans may run
after the engine has been switched
off 3 224.
Caution
After running at high engine
speeds or with high engine loads,
operate the engine briefly at a low
load or run in neutral for
approx. 30 seconds before
switching off, in order to protect
the turbocharger.
Keys, locks 3 21, Laying the vehicle
up for a long period of time 3 223.