Putting aside the fact that the claim made about rancid oil is pure fiction, the answer to your question is no. A cast iron pan is seasoned by carbonizing and p

Putting aside the fact that the claim made about rancid oil is pure fiction, the answer to your question is no. A cast iron pan is seasoned by carbonizing and polymerizing the oil under high heat, and what’s left can’t go rancid and isn’t really oil anymore.