My local stealer has both the red LR stuff as well as Peak Global, which they say is LR approved. I found the Peak Global at Pep Boys and did some diligence on it and it does seem to be good stuff. I also run it in my other cars with no ill-effects. It's a yellowish color, BTW.
So I take it the old style blue stuff I've got is no good for this engine then?
And as I have it empty at the moment and a new radiator to go on, that I should really fill with the red stuff?
I was surprised to see the red stuff was only 5 year, the last car I had with red stuff was a Toyota and there red stuff was called 4life and it was intended to last forever in there as far as I am aware.
It's your choice. If you want it by the book, use OAT in the Thor engine. Otherwise, use any of the others. Maybe consider spending the extra on some Water Wetter of other thermal reducing liquid if you use the G48 type or the standard type?
Also make sure you get a marker and write the type of coolant used on the reservoir. Remove the OAT Only tag on the top and write on the type you've used. Again, if you've used Genuine Part coolant, just write the part number on it. Any specialist should have access to MicroCat and be able to find the exact coolant used, right down to the size of the bottle used.