Differential oil change

OldGuyNewJeep

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I used the white teflon tape. No leaks or even seepage. But then again, I never used any before on my JK or JL and never had leaks or seepage then, either.
Factory uses liquid sealer. I used the same. Available at any auto parts store.





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Warz2k4

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I used the white teflon tape. No leaks or even seepage. But then again, I never used any before on my JK or JL and never had leaks or seepage then, either.
I'm probably going to follow instructions and use the "yellow" teflon tape.
 

Warz2k4

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@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...
I just researched some specs, it says 80W-90 for front /rear
is 75W/90 better?
 

DanW

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I just researched some specs, it says 80W-90 for front /rear
is 75W/90 better?
80w90 is conventional and is fine. 75w90 is synthetic and has some superior properties, particularly when the gear lube is cold. It should also hold up to higher temperatures better.
 

Rhinebeck01

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I just researched some specs, it says 80W-90 for front /rear
is 75W/90 better?
@Warz2k4

As @DanW said...

Just go with the synthetic, 75W90 Valvoline or Royal Purple.. These are what most everyone uses these days it seems.

No tow package so you would use 75W90 in both your diffs. Add no additive as additive is in the Valvoline and Royal Purple already..
 

Badweissenbier

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Just to add to this thread for future people.
I just changed both F/R at 20500 miles. Normal metal mud on the magnets and both oils looked fine. Honey in the front and a little more brownish in the rear. Since I tow a camper near max spec I went with Valvoline syn 75/140 in the rear. I did the change mainly because I do a lot of water fording and a bit of towing.
 

Mikeb16

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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.
how much of the Mopar friction modifier did you use?
 

garyji

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Michael,

Just use the Valvoline or Royal Purple in both diffs. They already have the additive.

G.
 

Bingman

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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.
 

BigBruse

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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.
@Mikeb16

Valvoline and Royal Purple, (sure there are other's) both have all the additive you need and you will not find yourself adding Mopar additive.
Does amsoil have the additive allready in it as well
 

wolf

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Does amsoil have the additive allready in it as well
Yes it does. It even says so in their advertising. I use only Amsoil. In my jlr.
 

Rhinebeck01

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Does amsoil have the additive allready in it as well
@BigBruse

I have never been a user of Amsoil and never will be. Over priced and there are offerings out there that do the job so.... My go to now, is Valvoline, FlexFills..

Anyway, per Amsoil in regard to their "Severe Gear" offering:
AMSOIL SEVERE GEAR is compatible with most limited-slip differentials. For applications that require additional limited-slip friction modifier, add AMSOIL Slip Lock®.
 

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