My friend, Louise Dewey, sent me this website which gives the estimated shelf life of most foods. Opened and Unopened estimates there.
http://stilltasty.com/

I noticed that the two most promoted “healthy” oils are also the two with the longest shelf lives.  Hmmm.  Coincidence?

One person’s food is another person’s poison,
Nerissa Oden
www.FoodPowers.com