Redline MTL or MT-90 are the preferred fluids. I have MTL in mine i think. It's a while since I changed it.
Although 75W90 GL3 was the correct fill it's hard to get and when I used a fluid that spec before going with the redline the changes got worse.
Manufacturer (Aisin Warner) recommended fill has been FULLY SYNTHETIC 10W-30 for some years now and is what you'd get if you had a fluid change done at a dealership.
Out of all of the people I've seen comment on jeepforum.com, that have used both redline and the motor oil, only one has stated they prefered the motor oil. All others have stated the redline fluids gave a slightly better change.