Differential oil change

DanW

Well-Known Member
First Name
Dan
Joined
Mar 2, 2017
Messages
7,771
Reaction score
9,926
Location
Indiana
Vehicle(s)
21 JLUR, 18JLUR, 08JKUR, 15 Renegade, 04 WJ
Vehicle Showcase
2
This thread is always fun to read. Do you all change the diff fluid on your other cars like they are in this thread? I mean I change mine often, but I use my Jeep in extreme conditions often.

Heck many passenger cars never get a diff fluid change in their entire like. My bud owns a trucking company. They change the diff fluid at the 150,000 mile mark on the big trucks.
Lol, no. The Jeep gets extra love. Lots of it. Partly due to going into extreme conditions, but partly because it is as much hobby as transportation.

My Ford Transit van, for example, got its transmission fluid changed at about 140k miles (manual says 150k). I think I did the diff fluid then. Ring and pinion teeth looked fine, but the gear oil looked spent. It also gets oil changes by the OLM, which is 10k miles. But it does still get premium oils and fluids. My wife and kids' cars get better than recommended maintenance, though, because they carry precious cargo.
Advertisement

 

Pepe My Little Mule

Well-Known Member
First Name
J.D.
Joined
Aug 3, 2020
Messages
205
Reaction score
251
Location
Pennsylvania
Vehicle(s)
98 Jeep 4.7L; 2020 Jeep Wrangler Unlimited Willys
This thread is always fun to read. Do you all change the diff fluid on your other cars like they are in this thread? I mean I change mine often, but I use my Jeep in extreme conditions often.

Heck many passenger cars never get a diff fluid change in their entire like. My bud owns a trucking company. They change the diff fluid at the 150,000 mile mark on the big trucks.
I change all the fluids in my Jeeps. Mainly because it's simple. They don't require complex tools or advanced mechanical skills to change them out.
 

Chupacabra

Well-Known Member
First Name
John
Joined
Oct 13, 2020
Messages
425
Reaction score
471
Location
Littleton, CO
Vehicle(s)
2021 JLU
This thread is always fun to read. Do you all change the diff fluid on your other cars like they are in this thread? I mean I change mine often, but I use my Jeep in extreme conditions often.

Heck many passenger cars never get a diff fluid change in their entire like. My bud owns a trucking company. They change the diff fluid at the 150,000 mile mark on the big trucks.
Do them big trucks have limited slip differentials that are known to chew themselves up early? Also guessing the pumpkin holds a little more than 1.5 quarts of oil too :).

Anyway, it's easy enough to do and cheap insurance I figure and as nasty as the oil look coming out I'd rather change it more frequently.

If it starts looking less nasty next time I'll maybe start extending the change interval.
 

CarbonSteel

Well-Known Member
Joined
Jul 21, 2019
Messages
1,915
Reaction score
2,161
Location
Colorado
Vehicle(s)
2019 Jeep Rubicon Unlimited
Vehicle Showcase
1
This thread is always fun to read. Do you all change the diff fluid on your other cars like they are in this thread? I mean I change mine often, but I use my Jeep in extreme conditions often.

Heck many passenger cars never get a diff fluid change in their entire like. My bud owns a trucking company. They change the diff fluid at the 150,000 mile mark on the big trucks.
That is like comparing apples to swordfish. Big trucks are over-engineered whereas Jeep axles have been neutered. Passenger cars never see the load or temperatures that Jeep axles do...
 

rent

Well-Known Member
Joined
Jul 18, 2021
Messages
339
Reaction score
683
Location
Roaming Around
Vehicle(s)
2021 JLUR XR
This is what many here use (me to) for their Rubi's:
(Some are also using Valvoline, Amsoil, etc.)

Using Royal Purple, you do not need any additional additives..
Dana 44, M210 (Front) 1.2 qts. Royal Purple 75w90 Syn. Gear Oil
Dana 44 M220 (Rear) 1.5 qts. Royal Purple 75w140 Syn.Gear Oil

What you do is buy 1 quart of the 75W90 and two quarts of the 75w140. Now, do your rear diff first with the 75w140 and you will have some fluid left over. Now, do your front with the 1 quart of 75w90 and since you will be a tad short of fluid, use the left over 75w140 to fill the diff, till it drips out. Per Royal Purple, there is absolutely no reason you cannot mix the two product weights together. I spoke with their rep on the phone..
I was all set to go with @Rhinebeck01's recommendation of 2 qts of Royal Purple 75W140 and 1 qt of 75W90 until I saw the following in the 2021 manual. Mine is a '21 JLUR XR, which has the M220 rear. So 75W90 (85) all around in my case?

Screen Shot 2021-10-20 at 10.42.58.png
 

cs2k

Active Member
First Name
Clarence
Joined
Apr 20, 2021
Messages
27
Reaction score
27
Location
San Diego, CA
Vehicle(s)
2021 JLUR 2.0
Occupation
Engineer
What I don't get is that the oil change schedule for front diff and rear diff are the same.

However, the rear diff seemed MUCH dirtier than the front when I last changed it. The oil from the rear had a lot of metal particles in it while the front was pretty clear.

This makes sense since the jeep spends most of its time in 2H and there is no ring/pinion wear on the front, just the spider gears.

I'm considering changing the rear diff on an accelerated schedule compared to the front.
 

Heimkehr

Well-Known Member
First Name
James
Joined
Sep 3, 2020
Messages
1,738
Reaction score
3,083
Location
Pennsylvania
Vehicle(s)
2021 Jeep Wrangler Unencumbered
I was all set to go with @Rhinebeck01's recommendation of 2 qts of Royal Purple 75W140 and 1 qt of 75W90 until I saw the following in the 2021 manual. Mine is a '21 JLUR XR, which has the M220 rear.

So 75W90 (85) all around in my case?

Screen Shot 2021-10-20 at 10.42.58.png
If I was using my Jeep for towing, even infrequently, I'd want 75W140 in the differential.

It's instructive to consider that the lower-spec M200 axle requires the heavier gear oil, without qualification.

Honestly, if I had the M220, and I got the blessing of a trusted mechanic friend, I'd use 75W140 even if I didn't tow anything. The rear axle clocks in for work every time we drive the vehicle. The front axle, less so.
 

Rhinebeck01

Well-Known Member
Joined
May 9, 2018
Messages
8,006
Reaction score
10,218
Location
.
Vehicle(s)
2018 2dr. Rubi
I was all set to go with @Rhinebeck01's recommendation of 2 qts of Royal Purple 75W140 and 1 qt of 75W90 until I saw the following in the 2021 manual. Mine is a '21 JLUR XR, which has the M220 rear. So 75W90 (85) all around in my case?

Screen Shot 2021-10-20 at 10.42.58.png
@rent

Do your homework... research ...... and you will see the 75w90 in the front and 75/140 for the rear is the way to go.... especially if towing.

Does not matter whether you have a 2018 or newer JL.

.
 

Jay 13

Well-Known Member
First Name
Jay
Joined
Aug 14, 2019
Messages
364
Reaction score
746
Location
Toronto
Vehicle(s)
JLUR
So doing this change this weekend (will be my first diff change)

I’ve read through plenty of the pages. I understand that 75w90 for the front seems to be the popular opinion. Some mixed opinions on the rear, depending if towing or not (I don’t have the tow package)

So is 75w90 they way to go for myself in front and rear…or should I be like the cool kids and put 75w140 in the rear regardless?

Thanks for any confirmation in advance.
 

Rhinebeck01

Well-Known Member
Joined
May 9, 2018
Messages
8,006
Reaction score
10,218
Location
.
Vehicle(s)
2018 2dr. Rubi
So doing this change this weekend (will be my first diff change)

I’ve read through plenty of the pages. I understand that 75w90 for the front seems to be the popular opinion. Some mixed opinions on the rear, depending if towing or not (I don’t have the tow package)

So is 75w90 they way to go for myself in front and rear…or should I be like the cool kids and put 75w140 in the rear regardless?

Thanks for any confirmation in advance.
@Jay 13

Your JL will be just fine with 75w90 in both front and rear... Buy 3 qts and get-er done...
 

Jay 13

Well-Known Member
First Name
Jay
Joined
Aug 14, 2019
Messages
364
Reaction score
746
Location
Toronto
Vehicle(s)
JLUR
@Jay 13

Your JL will be just fine with 75w90 in both front and rear... Buy 3 qts and get-er done...
I forget to put it in my original post…so for the sake of asking (again thanks for the original response)

Is there at all any benefit/advantages despite NOT towing, that I should consider running 75w140 in the rear?

Thanks again
 

Stormin’ Moorman

Well-Known Member
First Name
Michael
Joined
Mar 11, 2019
Messages
1,637
Reaction score
6,032
Location
Georgia
Vehicle(s)
2019 JLUR, 2020 JLUR, 2021 JL, 2021 GCL,1989 YJ
Occupation
Forester
Vehicle Showcase
1
I’ve changed my diff fluid in orangey so many times I’ve lost count. Between many, many water crossings, burying it in mud, dozens of 600+ mile days, and working on gears I bet I’ve changed the rear 8 times in 80,000 miles. I’ve had chocolate milk twice so I’m glad I did it. I run 75-140 in the rear and 90 in the front. Toyota makes the best gear oil.
 

Rhinebeck01

Well-Known Member
Joined
May 9, 2018
Messages
8,006
Reaction score
10,218
Location
.
Vehicle(s)
2018 2dr. Rubi
I forget to put it in my original post…so for the sake of asking (again thanks for the original response)

Is there at all any benefit/advantages despite NOT towing, that I should consider running 75w140 in the rear?

Thanks again
@Jay 13

First off, you can do no harm running 75w140 in the rear or in the front diff at that matter. Yes, gas mileage will be slightly impacted in a negative way when running 75w140 in the rear.

I do believe most here that have a clue will tell you that sure, running the 75w140 in the rear even if you do not not tow with your JL, is a positive thing and not a negative thing to do.

Especially if your JL sees more severe service then say going back and forth to the mall, etc., the use of 75w140 in the rear is a plus....

As I mentioned earlier for you to use 75w90 in both front and rear is just fine... but if you prefer and do not mind a slight hit on your gas mileage then go with 75w140 in the rear....

Can tell you that even if I did not tow with my Rubi (I do) I would be running with 75/140 in the rear. I'd do as I do now and buy two qts of 75w140 and 1 qt of 75w90..... I first fill the rear with the 75w140 and then take the left over 75w140 and the single bottle of 75w190 and fill the front diff. with the mix of the 2.. Use say Valvoline or Royal Purple that has additive in it already..

.

.
 

Jay 13

Well-Known Member
First Name
Jay
Joined
Aug 14, 2019
Messages
364
Reaction score
746
Location
Toronto
Vehicle(s)
JLUR
@Jay 13

First off, you can do no harm running 75w140 in the rear or in the front diff at that matter. Yes, gas mileage will be slightly impacted in a negative way when running 75w140 in the rear.

I do believe most here that have a clue will tell you that sure, running the 75w140 in the rear even if you do not not tow with your JL, is a positive thing and not a negative thing to do.

Especially if your JL sees more severe service then say going back and forth to the mall, etc., the use of 75w140 in the rear is a plus....

As I mentioned earlier for you to use 75w90 in both front and rear is just fine... but if you prefer and do not mind a slight hit on your gas mileage then go with 75w140 in the rear....

Can tell you that even if I did not tow with my Rubi (I do) I would be running with 75/140 in the rear. I'd do as I do now and buy two qts of 75w140 and 1 qt of 75w90..... I first fill the rear with the 75w140 and then take the left over 75w140 and the single bottle of 75w190 and fill the front diff. with the mix of the 2.. Use say Valvoline or Royal Purple that has additive in it already..

.

.
Sounds clear enough

Thanks again.
 
Advertisement

Winjet
 
Advertisement
Top