How to calculate cSt 40C

[glenncof]

If I know the cSt 100C viscosity and the Visc. Index, can I calulate 40C viscosity ?

I need this for Castrol since I don't find 40C vis. on website.

 

[paul_e320]

I always use this site.

http://www.geocities.com/CapeCanaveral/3655/index.html

Regards,
paul...

 

[flatlandtacoma]

Too bad Castrol also neglects to report VI.