Rubicon Diff Oil Consensus

[mgroeger]

Took me a while to realize this but seems to me that Jeep only builds to hit sales volumes at specific warranty fulfillment targets and CAFE standards. Anything that crashes at +1 mile or +1 day after warranty expiration is no problem for Stellantis. Anything that eeks out 0.001MPG with added costs that do not impact sales volumes are great. Anything that adds to maintenance costs while not compromising the warranty is nixed, even if the maintenance prolongs long term life of the vehicle.

The old school philosophy of over-building things is now a thing of the past.

I FIND YOUR DRIVEL AS BORING AS @yokramer 'S. CLEARLY YOU DO NOT USE AMSOIL. FAIL!

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[Jeep4Win]

I do 75w-140 front and rear per Dana.

 

[Philly_]

I also run 75W-140 front and rear. I use Valvoline for the flex fill pouches and it makes it very easy. I believe Amsoil also offers these.

I changed my diff oil at 20,000 miles, and surprisingly, the front looked worse than the rear. No abnormalities in the oil, but the majority of the first ~15k on the odometer were either off-road, or highway on my way to the trails, so lots of 4WD use.

Now that I've upgraded to 35's and added a some weight to the Jeep, I figured that was reason enough to go off of Dana's recommendation, which is the same as Jeeps for "heavy use" and towing. I've noticed no difference in drivability or fuel economy, and have made the trek from Detroit to NYC five times since the change. Once was also while towing a ~2,000lb trailer (max capacity for a two door).

 

[BuyHold]

I FIND YOUR DRIVEL AS BORING AS @yokramer 'S. CLEARLY YOU DO NOT USE AMSOIL. FAIL!

I put AMSOIL in my wiper fluid reservoir. Shown to decrease engine wear.

 

[mgroeger]

I put AMSOIL in my wiper fluid reservoir. Shown to decrease engine wear.

YES SIR!!! YOU GET IT! I USE IT IN MY BLINKER FLUID AND TO GREASE MY MUFFLER BEARINGS AND THEY ARE STILL GOING STRONG 546,732 MILES LATER!!!!

 

[CRZYCDN]

For sealing up the drain/fill plugs would this work? (Will be doing the diffs and transfer case)
Or is teflon tape a better option....is so, which one?

 

[CRZYCDN]

For sealing up the drain/fill plugs would this work? (Will be doing the diffs and transfer case)
Or is teflon tape a better option....is so, which one?

Bump for some input/guidance, would ve greatly appreciated.

 

[grimmjeeper]

Bump for some input/guidance, would ve greatly appreciated.

I use that on plugs if they don't already have sealant on them.

Don't use much. Just enough to coat a couple threads. It gets squished into a really small space.

Teflon tape works but can have bits break off and get into the oil, which isn't ideal.

 

[NWJeepr]

Bump for some input/guidance, would ve greatly appreciated.

Is there a reason you need sealant? I've never used sealant on drain or fill plugs for diffs, and they never leak (even torquing to recommended spec, which isn't much!)

 

[CRZYCDN]

Is there a reason you need sealant? I've never used sealant on drain or fill plugs for diffs, and they never leak (even torquing to recommended spec, which isn't much!)

More of a CYA... don't want any drips, nor having it leak after it's filled, then only way to seal it again is to dump the fluid and seal/start over. Just a "cheap"/proper way to make sure all is good.

 

[NWJeepr]

One thing I find interesting is heavy truck manufacturers are recommending lighter weight oils in diffs, 75w90, primarily for fuel economy. The longevity seems to be there. Even the medium duty 24k rear axle in my motorhome specifies it, of course, it uses like 3 gallons of it versus the <2qt that my Jeep's rear end does... But if those super heavy duty axles don't need 75w140 to do their jobs every day, I'm not sure my Jeep does.

Then again, I'm not sure it really matters all that much. Front/rear in my Jeep are currently filled with 75w140 because of Dana's spec sheet for Advantek rebuilds. I figure a heavier weight can't hurt it, but it also may not be doing much.

 

[grimmjeeper]

Is there a reason you need sealant? I've never used sealant on drain or fill plugs for diffs, and they never leak (even torquing to recommended spec, which isn't much!)

I've had diffs leak, especially with aftermarket covers. It doesn't hurt.

 

[grimmjeeper]

One thing I find interesting is heavy truck manufacturers are recommending lighter weight oils in diffs, 75w90, primarily for fuel economy. The longevity seems to be there. Even the medium duty 24k rear axle in my motorhome specifies it, of course, it uses like 3 gallons of it versus the <2qt that my Jeep's rear end does... But if those super heavy duty axles don't need 75w140 to do their jobs every day, I'm not sure my Jeep does.

Then again, I'm not sure it really matters all that much. Front/rear in my Jeep are currently filled with 75w140 because of Dana's spec sheet for Advantek rebuilds. I figure a heavier weight can't hurt it, but it also may not be doing much.

The lighter weight oil isn't a problem when you have a lot of it in the diff. The problem in the Jeep is mostly based on the <2qt fill.

 

[Odyssey USA]

I ordered yellow, chemical resistant, teflon tape. I need to swap fluid. 98k miles lol. At least it’s 99 % street. It was my wife’s and the car hardly ever parked.

 

[CO2Wrangler]

Edit: Disregard what I wrote below. Whats shown in your image is PTFE. Apologies for the overzealous response. That stuff is perfect.

Bump for some input/guidance, would ve greatly appreciated.

Don't use this. You'll have a hell of a time getting them back off. Use some PTFE paste imo.

You don't need much.

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