This viscosity blending calculator link is great, but I am afraid someday it could become unavailable. Also you always have to log on to use it. Does anybody have the formulas for these calculations? I am really only interested in the 100cSt values. It would be nice to be able to plug it into my pocket calculator or run it on a spreadsheet. Thanks.

Couldn't wait. It is the correct equation. I ran 50/50 mix of cSt 10.5 with cSt 13.5. Both the online calculator and the equation gave me 11.9. I tried 5% 100 cSt with 95% 13 cSt and the online calculator gave me 14.4 whereas my pocket calculator gave me 14.396.

i was searchig for the link to see the information about the misxtures but i couldn´t open the webpage, so i was wondering if you have other link to see that info or if you can correct the url to can open it.
thanks