75w-110 is a bit more rare here in the US than, presumably, Europe. I think the only one I have seen is Amsoil.



Couple of cut and pastes from webpages. (Bob is the Oil Guy/Oil Advisor)

 

Yes, 75w-110 is only aviailable from Amsoil, Red Line and Ravenol to my knowledge. But alle three are high quality oils.
The old SAE 90 viscosity class was simply "Split in half", into SAE 90 and SAE 110 in the year 2005, after the owners manual of our cars was printed.
Explanation: https://en.oelcheck.com/wiki/sae-classes-110-190/

 

The Amsoil 75W-110 can be purchased in a 1 (US) quart plastic bag which can be squeezed into the differential fill port. The differential only holds 0.78 quart so one bag will do it. Others may be available in bags too.

-- Chuck

 

I trust this brand, Gargoyle. Great for hypoid gears.

 

It's odd how different sites have slightly different explanations of the upper number (90 versus 140). FWIW, I've been using Mobil One synthetic 75W-145, for 8-years on my S2K. No problems, no noises. Change it every two years.

 

Actually, the different sites have opposite descriptions! Your link says 90 is thicker at high temperatures and 140 is thinner at high temperatures (wrong). It then says that thinner oil is better at high temperatures, which makes no sense.

Lower number = thinner = better for low temp.
Higher number = thicker = better for high temp... just like motor oil.

https://addinol.de/en/products/lubri...ils/sae-75w90/

https://www.thetruckstop.us/forum/th...r-75w-90.1678/

https://www.rv.net/forum/index.cfm/f...print/true.cfm

 

Yes indeed. It is not just websites about motor oil that are goofy as well. I find disconnects all the time in all manner of so called "expert sites".

 

Performed well in the engine gear boxes of the Hindenburg!

 

Not a big fan of Amsoil's boutique oils

 

Do I need a wayback machine to buy it?