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So you want to say that GM specified AMSOIL? If you look on my table on first post you will see AMSOIL 80W-90 there. But I know of no factory fill synthetic 80W-90 like you stated. Yes, Chevy, GM even Ford have 75W140 synthetic rear axle, but that's not the subject of this thread.

I saw 80W-90 only mineral or semi-synthetic.

Amsoil is synthetic. The base is as thin as other synthetics probably (at 40C), so that's why. People keep saying "I have used 75W-90 and was fine. Well... as e can see not all 75W-90 are the same. Secondly, if they had a HD truck and they never used it as truck, but an a commuting vehicle...

That's the problem that I try to point. We can't look, for this differentials at the 90. That's meaningless, unless your differential runs at 100C/212F. You need to look at the 40C/104F spec values. And indeed the "fuel economy" made those fluids, especially the ones on US market, go to the...

I didn't have a question. Just wanted to share my research into this matter.

If an open differential gets much hotter than 20C over ambient, IMO there is something very wrong with it. This is not a transmission with a torque converter that uses oil friction to transfer torque. Those are just some gears splashing in oil. I think that range around 40C is essential and...

Firstly, I am using still a 75W, it just is 110 instead of 90, because that fits better with my 40C differential operating temperature. Also... Even if I was using 80W, I am warming it up from 60-70F (20-30C), not from frigid -40F/C. There is no benefit, even at 0C/32F, probably.

see a lot of people asking if their specification 80W-90 can be substituted with something else. Invariably the chorus here says "use 75W-90 is better because muah, synthetic". Since my car differential and transfer case also requires 80W-90, I kind of thought... why Toyota din't say 75W-90 if...

But are the Calcium Carbonates sticking to the metals like they say?

They say "Unique lubricant with solid microscopic particles offers low drag/high protection." Also "Avoid use with pumps, coolers and filters as unique medium and affinity for metal can cause clogging". They don't say what solid lubricant it is exactly. "Trade secret". But there are not too...

As I see, Redline has a product that has similar solid lubricants in suspension, with "metal affinity": https://www.redlineoil.com/heavy-shockproof So the big oil blenders are using this new technology too.

Where did you saw that "advise against"? It's the other way around, MoS2 is cheaper, not better. Also, was that nano sized additive - those are pretty new.

I think I will measure with a handheld "laser" sight IR gun. Before and after. I don't have a sensor in that differential/transfer case.

Well, once it clings on the iron it can be dry or wet, so who cares? It's a thin layer between two metals... At high pressure, when the liquid film breaks, all it remains is dry friction. But yeah, I see what you are saying... Anyway, where is that liquid used in?

Why is that?

I listed a few links above of people who did the "science" for me. I get your point, nobody should do anything that's not already done by a big oil company. Thanks. Also... More better: https://www.quora.com/Is-more-better-a-grammar-mistake

The material that I read claims that WS2 will bind to iron surfaces, when heated by friction. Inside a differential, the oil is constantly splashed around, can't see it settling down. Did you read about Liqui Molly? They made a whole brand out of the Molybdenum disulfide MoS2, a very close...

Anyone has any experience with mixing WS2 in gear oils? Positive, negative? I understand that will create a very thin film (particle size thickness), with ultra low friction. I am tempted to add one oz of WS2 in each of my rear differential and the transfer case. Both non LS, the differential...

That's not happening at all to me. In the Amazon Stick menu you can activate CEC. That way I can turn on and off the TV with the stick remote.