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Old 09-14-2016, 10:11 AM
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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?

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Old 09-14-2016, 10:56 AM   #2
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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?
IMO yes, but it would be better to use the correct 80w-90 spec. If towing or extreme duty then use 75W-140.

This is the OM from 2014, might check your year and make sure it says the same thing.


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Old 09-14-2016, 11:15 AM   #3
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I run 75w-90 royal purple in my front diff, and I have a rubicon so no LSD, works just fine.
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Old 09-14-2016, 12:57 PM
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only tow a 4x8 utility trailor a couple of times a year.

I followed the wayoflife writeup:

MAINTENANCE : Jeep JK Wrangler Differential Fluid Change Write-Up

rear diff was easy. Gear oil was black.

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!!)
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Old 09-14-2016, 05:03 PM   #5
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Yes it will be fine, run whatever weight you want within reason.
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Old 10-25-2016, 11:02 PM   #6
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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?
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Old 10-26-2016, 07:37 AM   #7
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I run Royal Purple in mine. I love it. All my fluids are Royal Purple.
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Old 10-26-2016, 08:08 AM   #8
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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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Old 10-26-2016, 11:17 AM   #9
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The fiction modifier has no affect on open differentials.
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Old 10-26-2016, 01:29 PM   #10
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the fiction modifier has no affect on open differentials.
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