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AX-15 fluid for my XJ


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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?

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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.

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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.

 

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