Nissan switched from Nissan green (phosphate free and a couple other things) to Nissan Blue about a decade ago.My 2017 Nissan Frontier with the 4.0 v/6 engine has only 35000 miles, but the radiator seems a little low, and I would like to top it off. In the old days I would just grab some green antifreeze, and mix a little 50/50 and dump it in. But now I don't know what I should use. The stuff in its does look green, or perhaps blue. Oh, and I am quite sure it is original, since I bought it in 2018.
Both will be fine.
Can be had as "asian Blue" coolant at Walmart.