I saw that when i was searching for some threads of this subject, i was going to ask you what you ended up using.
From what i saw, most SAE 80 and "80W" GL-4 have a cSt@100 around 10~10,9, the 75W-80's around 8.9~9,5 and 75W-85's around 11~13.
So for our oldies, the 75W-85 will give us a...