The thing about JD Cool Gard II is my general interest because it’s a product that I have and use. And @nthach
knows their stuff.
It’s not a matter of over thinking. It’s a matter of a new to my brother vehicle which we are going to baseline all fluids and filters, and so knowing what was used, and what should be used for that vehicle, especially since the Toyota 4.5L I6 seems to eat head gaskets,,, Napa red is the easiest/most cost effective. Napa also has the peak red thus my interest in that too. Why not do the comparison? Otherwise why does this site even exist?!?