Motor oils contain additives to meet specific engine requirements. Although they don't break down with age, they may not meet manufacturer recomendations for todays engines. I personally would be afraid to use them, the savings is not worth the risk.
They should be able to research the specs for the oil on the web. Those numbers should be in the labeling on the top of the can.

When I drain old oil cans, I sell the oil for a couple dollars a gallon to some friends to lube chains and such.
Chuck