Am about to change the diff oil on my jku.Mine does not have lsd. My question is will it be ok if I use royal purple 75w90 with friction modifier additive?
Front was PITA. had to use a tube so i could get enough Clarence to feed in the gear lube. Gear oil was still good (mostly clear) but changed it anyways.
I am hoping 75w will be better for extreme cold temperatures if its anything like last winter (couple of days it was -45C with the wind chill!!)
So if I put the same synthetic with friction modifiers in the front that I used in the LSD rear, it wouldn't have any negative effects on the front when it is engaged? Or does the front need it without the friction modifiers?
The friction modifiers shouldn't be a problem for a non-LSD or e-locker differential. I understand wanting to use syn in the front so you just buy one type of oil, but the front will be fine with 80W-90 dino oil.
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