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You live in Montana, It's cold. I would use 5w30 Mobile1 for oil, ATF+4 in transfer case, Royal Purple Synchromax I hear is really good in the NV3550 trans, I will use it next service, Dino gear lube in diffs, (non synthetic) No Lsd additive unless you have an LSD. Do some searches on here as well as google. Enjoy your new jeep and welcome to Wranglerforum.com :wavey:
 

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Its all going to be personal opinion...

i personally use mobil 1 5w30 motor oil and amsoil tranny fluid...
 

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Its all going to be personal opinion...

i personally use mobil 1 5w30 motor oil and amsoil tranny fluid...


That's pretty much it. All personal opinion. :angel:
 
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