I use cast iron seasoning oil on my iron pans. One has been in my family for literally over 100 years and the other has been in my house since my marriage over 15. We all know that cast iron does not exactly go bad so really there is no special care these pans need in order to stay in good working shape as they age. But if you want to get the best flavor out of the foods you cook, you should season your pans. You have a few choices to do this. You can either oil them with olive oil or you can buy seasoning oil.
These special oils might be seen by some as a little gimmicky. After all, you can just oil your pan with a good cooking oil. However these seasoning oils are formulated with the right oils so that the best flavors will come out of whatever you cook in the pan.
They are not that expensive to buy either. If you ever go camping you really need a can of this stuff. It’s about $10 but since it comes in a spray can it is easy to travel with, and you can use it camping or at home.