The ancient oil is not worth anything practical, but to a collector might have value if just for display in a clear bottle or scientific study with a Blackstone analysis. I would not put it in any engine I cared about. I'd wager it's probably contaminated by moisture, maybe metallic rust particles, who knows. Very low quality oil by modern standards.
It has far more value to a collector or research than as a engine lubricant at this point. Analogy is using paper money as fire kindling.
The can is probably worth a bit to a collector on auction sites.
Unopened is probably the top dollar value.