I just researched some specs, it says 80W-90 for front /rear@Warz2k4
What you would use is 75W90 in both the front and the rear diffs.
IF, if your JL/JLU, has the tow package then use 75W90 in the front and 75/140 in the rear.
Use either Valvoline FlexFill pouches or Royal Purple as both have additive.... SO... you do not need to add any Mopar additive to them.
Read back through this whole thread for info that will help you buy/do the deed.
Personal preference when you want to do mileage wise... I did my first on my Rubi at 20,000 mi.. Some will say do sooner and some say wait for more mileage. Easy to do and very inexpensive to do so...
@Warz2k4I just researched some specs, it says 80W-90 for front /rear
is 75W/90 better?
how much of the Mopar friction modifier did you use?you can run the oils with LS additive in them in a vehicle without limited slip. No harm done.
I run amsoil 75w90 in front and 75w140 in rear with mopar LS additive. (I have LS in my sport)
The rubicons do not have limited slip they have e-lockers which do not require additive.
FWIW I run Mobil 1 75w140 synthetic and it also has the required additive for my limited slip d44. I’ve changed it 2 or 3 times so far and have had no issues with it.
Does amsoil have the additive allready in it as well