jon1998 Posted March 2, 2018 Posted March 2, 2018 I sold my Comanche, but picked up a 40k mile 1999 XJ in its place. It has the ax15 and I changed the trans fluid when I first got it since I was worried about factory GL5 fluid eating up the brass synchros. I put 10w30 synthetic in it, since that seemed to be the best choice at the time, but now I'm starting to worry I made the wrong choice, I called a local Jeep specialist and they said they wouldn't recommend it. Its also getting a little hot outside, I live in FL, and I'm worried about the oil getting too thin. What do you guys use in your XJs/MJs with the ax15?
Eagle Posted March 2, 2018 Posted March 2, 2018 The recommended lube chart at my Jeep dealer now shows 10W30 synthetic motor oil as the correct juice for the AX-15. I think I'd be more comfortable using one of the full-synthetic, sulpher-free gear lubes like Royal Purple.
75sv1 Posted March 2, 2018 Posted March 2, 2018 For the NV3550 Royal Purple makes the Synchromesh. Also, I think Pennzoil made something for the NV3550. I do not know if they are compatible for the AX-15, but worth checking. Might see if NAPA or even Royal Purple will cross check as to what is compatible for the AX-15.
fiatslug87 Posted March 3, 2018 Posted March 3, 2018 Redline MT-90, GL4, safe for brass https://www.redlineoil.com/mt-90-75w90-gl-4-gear-oil see this discussion thread
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