Its the g12
It may say 'G12' on the expansion bottle, but as Rhyso correctly stated, it is actually 'G12 plus plus' (or 'G12++')
If you go to the service counter and ask for G12 antifreeze for a gti mk6 golf will they give the correct stuff ? or do you have to say "hello i`m a complete idiot and assume you are to,can i have some g12++ ,or is there a funny handshake i need to give to ?) 
If it is in a grey bottle, rather than the older white bottle, then it will be the very latest G12++.
And be careful where you do your funny handshake - you might spill it!
