Synthetic Differential Oil

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I just checked auto parts store yesterday. Two Mobile-1 Diff oil are available 75-90 and 75-145

Is the 145 compatible with our rigs? Is it better if I am willing to pay extra for it?
 
Write up from Mobile-1
Mobil 1 Synthetic Gear Lube LS 75W-140

Designed to meet the requirements of light trucks and SUVs where an API GL-5 75W-140 gear oil is recommended.

Mobil 1 Synthetic Gear Lube LS 75W-140 is a premium performance, synthetic, multi-purpose, automotive gear lubricant designed to meet the highest level performance requirements of many modern passenger vehicles in all types of operating conditions including limited slip applications, as well as deliver outstanding power transfer performance. Compared to conventional hypoid gear lubricants, Mobil 1 Synthetic Gear Lube LS 75W-140 performs exceptionally over a wide range of temperatures.

Mobil 1 Synthetic Gear Lube LS 75W-140 achieves this through a unique proprietary combination of synthetic base oils and a unique additive system, including the SuperSyn anti-wear system, that deliver optimized viscosity-temperature properties together with the highest level of inherent formulation stability and protects against thermal and oxidative degradation, wear and corrosion, and viscosity loss associated with premature shearing.

Mobil 1 Synthetic Gear Lube 75W-140 LS contains special friction modifiers designed for limited slip-type differentials. In most applications, the addition of special LS (limited slip) additives is not required. For axles requiring the highest level of limited-slip performance, OEM specific LS additives can be added to this fluid.

For more information, see the Mobil 1 Synthetic Gear Lubricant LS 75W-140 Product Data Sheet and Material Safety Data Sheet.
 
Write up from Mobile-1
Mobil 1 Synthetic Gear Lube LS 75W-140

Designed to meet the requirements of light trucks and SUVs where an API GL-5 75W-140 gear oil is recommended.

i.e. not an OEM Toyota LC rear diff. Toyota specifies 80w90 or straight 90. I think 75w140 is overkill, unless you have a rear autolocker that you want to quiet down. Save your money and get the regular weight stuff
 
Not sure what autolocker is - do you mean e-locker.

Doing a 4.88 gearing. So I want as much protection as I can. Not going to do this project again.
I am wondering if the heavier oil will protect parts better in the back and forth driving that happens on 4x4 trail driving. I sounds like it will provide some dampening to the gears.
 

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