relationship of oil viscosity to temp?

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What is the relationship between temp and viscosity for a multi-grade oil? Specifically, is it roughly linear from a moderate temp to 100*C? So if you have the cSt for a given oil at 40 and 100 *C, can you extrapolate down to 50*F and estimate what it would be at say 80*C and 140*C? Thanks!
 
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