Diff fluid - Wrangler JL

[CarbonSteel]

You certainly are persistent in selling...

Not selling anything. Make your own choices, but nothing I said was not factual.

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[grimmjeeper]

Not selling anything. Make your own choices, but nothing I said was not factual.

I never suggested you don't have a lot of facts...

 

[roaniecowpony]

I am betting that Dana would say two things:

1. FCA - stop reducing the oil capacity in our axles.
2. FCA - stop telling Jeep owners to deviate from the 75W-140 that we recommend.

Stumbling around the internet in the wee hours. Browsed some papers on axles. Found one that studied the churning losses and thermal effects. As you might have guessed, churning losses/temperature are affected by viscosity and fill level. What surprised me was that churning losses were comparable to the frictional losses in the study.

I recently changed the gear oil in my 14 GMC truck diffs. IIRC, they are low capacity as well. The rear probably being just under 2 qts.

Since your axles are instrumented now, it would interesting to see direct test comparisons of viscosity effect on temperature as well as fill levels, while keeping test parameters as close as practicable.

 

[TxJeepers]

This has been an interesting read. The Valvoline in pouches looks good but question, can you put the version with the limited slip additive in Rubicons? Or do you have to explicitly get gear oil without for Rubicons with lockers?

 

[CarbonSteel]

This has been an interesting read. The Valvoline in pouches looks good but question, can you put the version with the limited slip additive in Rubicons? Or do you have to explicitly get gear oil without for Rubicons with lockers?

Yes; the limited slip additive will have zero impact on the lockers. At this stage, you would be hard pressed to easily find a synthetic gear oil that does not have the additive in it.

 

[Rhinebeck01]

FYI

Price right now... today 4/15/23 is lowest it has been in 30 days....
23% off. $13.13 per bag
https://www.amazon.com/gp/product/B08KB5LTJM/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8psc=1

Well, this thread reminded me I needed to go to Amazon and order another Valvoline Flexfill SAE 75W-140 Full Synthetic Gear Oil 1 QT, Case of 4 for the next diff fluid change.

https://www.amazon.com/gp/product/B08KB5LTJM/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8psc=1

 

[JT1]

FYI

Price right now... today 4/15/23 is lowest it has been in 30 days....
23% off. $13.13 per bag
https://www.amazon.com/gp/product/B08KB5LTJM/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8psc=1

Down a few more pennies today. That's a great deal

 

[TordFuglstad]

I'm unable to find the Valvoline pouches here in Norway.

Would Lucas oil or MSOIL SEVERE GEAR be good alternatives?

Thanks!

 

[Fatbob Frank]

I'm unable to find the Valvoline pouches here in Norway.

Would Lucas oil or MSOIL SEVERE GEAR be good alternatives?

Thanks!

Either one.
I prefer Amsoil Severe Gear personally...

 

[roaniecowpony]

I'm unable to find the Valvoline pouches here in Norway.

Would Lucas oil or MSOIL SEVERE GEAR be good alternatives?

Thanks!

LiqiMoly, mobil, Shell, Castrol should be available iin Norway. The specifications call for GL-5 gear oil.

 

[PunksJL]

Just installed Dana Spicer AdvanTek front and rear diff covers on my 2025 JLURX. Filled with Valvoline 75W-140 front and rear per Dana Spicers recommended specification.

 

[Old Dogger]

Yes, I have ran Lucas for many years. I have never had a gear failure here, in hot as Hell Phoenix.

 

[kdiff]

This has been a helpful thread. Thank you everyone, especially @CarbonSteel

 

[kdiff]

Just installed Dana Spicer AdvanTek front and rear diff covers on my 2025 JLURX. Filled with Valvoline 75W-140 front and rear per Dana Spicers recommended specification.

Do you happen to remember about how much oil you used in total? I’m going to have the gears changed out and replace the stock covers with the Dana AdvanTek covers. They look like they might be a bit bigger in internal volume though I don’t know until the stock covers are removed. Did you get the grey, blue or primed version? I got the primed. Going to paint them black. Also, did you reuse the stock gaskets?

 

[PunksJL]

Do you happen to remember about how much oil you used in total? I’m going to have the gears changed out and replace the stock covers with the Dana AdvanTek covers. They look like they might be a bit bigger in internal volume though I don’t know until the stock covers are removed. Did you get the grey, blue or primed version? I got the primed. Going to paint them black. Also, did you reuse the stock gaskets?

I bought 4 of the 1 quart flex packs but only ended up using 3 total to get both the front and rear refilled. I doubt the covers change the internal volume based off my observations.

I bought the grey version and they look very nice. I did reuse the stock gaskets and the hardware that was provided with the covers. You could reuse the factory bolts as they are the same length and grade. I torqued them to about 22-24 lb. ft.

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