75w85 rear differential gear oil what are you using

[swamp2]

Appreciate the comments, esp those below. Spot on.

Also, the overall test results for both Red Line and Royal Purple were not as good as Mobil 1 and Castrol. I highlight this because both RL and RP tend to be the "darlings" in most automotive forums along with Amsoil.

It is an important highlight because it shows that off the shelf oils such as Mobil 1 and Castrol can perform as well if not better than boutique oils like RL and RP at less cost and thus there is no need to chase such oils as there is no marked difference except increased cost for less performance.

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[Dorf2point0]

Dana specifies 75W-140 in their Dana 44 Advanteks. The OEMs reduce the viscosity chasing CAFE credits (MPG).

https://fbaum.unc.edu/lobby/_107th/...dits,standard, the manufacturer earns credits.

 

[Deano Bronc]

None--synthetic oils handle heat and cold far better than conventional oils ever will.

I was planning on changing out the rear diff gear oil and putting in Amsoil 75W-90. Would you use the same in the front?

 

[CarbonSteel]

I was planning on changing out the rear diff gear oil and putting in Amsoil 75W-90. Would you use the same in the front?

Just me, but as Dana recommends 75W-140, I would run 75W-140 in the rear and is something thinner is desired in the front, then 75W-110.

 

[Deano Bronc]

Just me, but as Dana recommends 75W-140, I would run 75W-140 in the rear and is something thinner is desired in the front, then 75W-110.

Thank you. I'll order as you suggested.

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