Mobil1 75w-90 vs brandx 75w-85

Amsoil and Redline has it.

Amsoil site has an interesting and excellent base for the specs on the 75w110..........which is currently in my daughters Tahoe.........from what I understand, the 90wt of today is on a different scale than in the past........
@Pablo can elaborate on the subject.
It was probably thicker when it was dino oil.
 
Amsoil and Redline has it.

Amsoil site has an interesting and excellent base for the specs on the 75w110..........which is currently in my daughters Tahoe.........from what I understand, the 90wt of today is on a different scale than in the past........
@Pablo can elaborate on the subject.
https://www.amsoil.com/p/amsoil-severe-gear-75w-110-100-synthetic-gear-lube-svt/?zo=515729

Basically (now years ago) SAE split the old SAE Gear oil range 90 into the new 90 and the new 110 ranges.

I find it comical there are so many old images of the old chart still on the interwebs

1752533316601.webp


And so few NEW compliant charts:


1752533421313.webp
 
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