TJ Rubicon Differentials Oil Change interval - JeepForum.com
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post #1 of 19 Old 09-16-2017, 06:55 AM Thread Starter
mrblaine
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TJ Rubicon Differentials Oil Change interval

I read a lot more than I post and I've missed this somehow. Does anyone know why the service interval is 12,000 miles?


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post #2 of 19 Old 09-16-2017, 07:25 AM
Jeepsr4me
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because the damn thing is expensive an why take a chance....
Heck I dont know just marking this in case a factory guy says why..
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post #3 of 19 Old 09-16-2017, 08:59 AM
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I think modern vehicle manufacturers consider diff lube to be "lifetime" under their "light duty" maintenance schedules, and although I don't have my owners manual or fsm in front of me, I'll bet that's what you'll actually find in any TJ's manuals, Rubicon or not. I'm pretty sure the 12000 mile interval you're referring to is Jeep's recommendation for "severe service" such as frequent offroading or trailer towing

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post #4 of 19 Old 09-16-2017, 09:08 AM Thread Starter
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Originally Posted by rouxbicon View Post
I think modern vehicle manufacturers consider diff lube to be "lifetime" under their "light duty" maintenance schedules, and although I don't have my owners manual or fsm in front of me, I'll bet that's what you'll actually find in any TJ's manuals, Rubicon or not. I'm pretty sure the 12000 mile interval you're referring to is Jeep's recommendation for "severe service" such as frequent offroading or trailer towing
Could be. All I know is I have a problem Rubicon here that I am having my dealership buddy help me with and we were discussing the use of synthetic lube in the front diff. He said the service interval was 12,000 miles and I asked if he was sure. He whipped out the owner's manual and pointed to the mileage interval. I didn't look to see if it was the severe duty schedule but I certainly can.

I will say that I can't see towing as being any more severe on the front axle than not towing though.

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post #5 of 19 Old 09-16-2017, 09:46 AM
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Quote:
Originally Posted by mrblaine View Post
He whipped out the owner's manual and pointed to the mileage interval [12K]. I didn't look to see if it was the severe duty schedule but I certainly can.
Yes, Schedule B (criteria below)advises every 12K mi.


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post #6 of 19 Old 09-16-2017, 01:33 PM Thread Starter
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Yes, Schedule B (criteria below)advises every 12K mi.


Attachment 3468482
Yep, I got out the manual and read it. 12,000 miles if you go offroad.

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post #7 of 19 Old 09-17-2017, 12:55 PM
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They also spec the 80w-90 for the front diff. I've just been using the 75w-140 in both axles so I don't have to keep two weights of diff oil for it.


I've never changed mine that often, but I don't do severe offroading either. Logging rds, forest service rds, fields, etc. It has never looked very dirty when I've changed it.

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post #8 of 19 Old 09-17-2017, 03:10 PM Thread Starter
mrblaine
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Originally Posted by jkp View Post
They also spec the 80w-90 for the front diff. I've just been using the 75w-140 in both axles so I don't have to keep two weights of diff oil for it.


I've never changed mine that often, but I don't do severe offroading either. Logging rds, forest service rds, fields, etc. It has never looked very dirty when I've changed it.
It doesn't specify severe offroading. It just says taking it offroad.

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post #9 of 19 Old 09-17-2017, 03:33 PM
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Yep, I know. It says never change it, or change it every 12K if you go offroad.


I change mine about every 30K and the gear oil that comes out doesn't look much different than what I put back in. I've never pulled the diff covers on it either, I just use the drain plugs.


I'm at 165K or so on it now. Bought it new.


The '92 manual says 30K for normal service and 12K for severe. I've been running 75W-90 in the 30 and 35, change it roughly every 30K, and it's at 270K on the original axles.

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post #10 of 19 Old 09-21-2017, 10:55 PM
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Any idea on time and not mileage I know that mine was changed when I had it re-geared but that was 3 or 4 years ago, but I think it was only about 4,000 miles ago. So is it time ?

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post #11 of 19 Old 09-22-2017, 07:10 AM
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Nothing is going to happen to your gear oil while the Jeep is parked unless your parking spot gets flooded above the tops of the vent tubes.
I've never understood the concept of drivetrain gear oil changes based on time.


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post #12 of 19 Old 09-22-2017, 09:15 AM
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Time based changes have to do with heat and contraction of the oil from atmospheric changes. This can draw in moisture and that moisture will build up to point of causing the oil to have water in it.. and where does water go in a oil sealed system? to the bottom of the oil. We get sent over seas and we leave our cars in a parking lot on base. When we get back there would be water in the axles and engine... Folks complained that the site was flooding.. Nah,,, Just lots of rain and heat.. No flooding.. Those are extreme cases.. setting for a month and then being driven will burn off most of that water...
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post #13 of 19 Old 09-22-2017, 10:48 AM
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That is an extreme case.
For what plumber1 was asking I see no need for time based changes in an axle.
Once driven at speed for any amount of time any small amount of moisture will be heated to the point of becoming vapor and will exit through the breather.


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post #14 of 19 Old 09-22-2017, 10:57 AM
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I think basing your maintenance on hours vs miles is centered more around trail rigs than it is street driven rigs. Much like ATV maintenance is hours and not miles. You may have only a few miles, but those miles may be very hard miles.


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post #15 of 19 Old 09-22-2017, 12:57 PM
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My guess is that it is a defense against warranty claims. I can see the conversation at the dealership:


Service Manager: "Sorry sir, it looks like your front differential needs to be replaced. How many miles on the Jeep?"


Customer: "20,000."


Service Manager: "Have you ever had the Jeep off road?"


Customer: "I took it on a gravel service road once."


Service Manager: "Did you change your front differential fluid at 12,000 miles?"


Customer: "What??"


Service Manager: "Not covered under the warranty. That will be 4 grand..."

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