The procedure seems simple enough, but I am concerned about how much fluid should be added and when. If there is an external cooler, which are cars of course have, there is a thermostat which opens up at 70 celsius. And according to the video above and another video by Meyles (posted below), we should then overfill by 0.5 liters or drive and then fill it up again? I'm slightly confused. Can someone explain? Is there a definitive guide on how much to fill/when?