I run the Nulon red as my research at the time showed that it met the recommended specification plus my WJ was already running the red stuff as it was and I didn't want to have to go to the trouble of a full flush to get rid any trace of the existing coolant. However, in reality any OAT or HOAT coolant that meets the MS-9769 specification will do the job - plenty of guys on here running the Nulon green for years without an issue.
You should try to utilise the search function on this forum - it works well! Just completed a search and found a number of threads covering this including this one that has a lot of valuable information for you:
http://www.ausjeepoffroad.com/forum/...d.php?t=107108