Originally Posted by marc1kim
But all we know right now is that Chrysler superceded their ax-5/ax-15 fluid with 10W30. I'm going to make a few phone calls tomorrow to some dealers to verify the changes. I wish there was a way to contact Jeep to verify that 10W30 is OK. If everything checks out, then my heep is getting some fresh Synthetic 10W30.
Well I finally bit the bullet and changed the oil in my trans. It was getting too hard to shift. I decided to be the guinea pig and use synthetic 10W30 (which is what Chrysler is recommending now).
once I pulled the fill plug my heart sank when I got a strong sulfer smell, and again after draining slightly glittery oil. I guess the Original owner had replaced the fluid and used GL-5
I got about three quarts out of the tranny, and it took almost all of four to fill it. And after test driving, man it sure felt good to shift!
BTW, I emailed Jeep about the whole fluid change over, and the person that responded recommended consulting the appropriate manual...duh!
But apparently the whole ax-5/ax-15 fluid supersesion to 10W30 is old news:
I did find a website that classfied 10W30 and GL-3 the same..can't find the dang link...But it makes sense since GL-3 has no addatives.
A concern, was the fact GL-4 has half the Sulfer based addatives that GL-5 has. So I wonder if GL-4 is bad for the trans as well.