I need to do coolant flush on my FR as recently had oil cooler change and coolant is black. My expansion tank says G12 and I was recommended to use Triple QX pink antifreeze but it doesn't say anything about G12 on the bottle. Having done bit of research, I found VW have discontinued G12 and G13 is the replacement. So I've found Triple QX purple antifreeze which says G13 which I assume might be the right one but I rarely see anyone using purple coolant. So quite confused which one to get. Can anyone help?