Yes, drain by the rad drain point, it's the lowest point on the system.
Unfortunately the 306 isn't self bleeding so you will need to bleed it, this is a bit of a pain and requires you to make a header tank from an old coke bottle or similar.
The ratio should be written on the bottle....it's probably about a 3rd antifreeze to 2/3 water for winter temps.
5 litres of concentrate is more than enough. The whole system on a GTi is 7.5l.
Unfortunately the 306 isn't self bleeding so you will need to bleed it, this is a bit of a pain and requires you to make a header tank from an old coke bottle or similar.
The ratio should be written on the bottle....it's probably about a 3rd antifreeze to 2/3 water for winter temps.
5 litres of concentrate is more than enough. The whole system on a GTi is 7.5l.