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We just got a cast iron and we called the company about the seasoning. They said it is seasoned with oil only. We spoke to the OU and they said if it is made here and then all oil in the USA is fine. We called the company back and they said, yes it is made here and not in China. The OU said it fine to use-it doesn’t have to be kashered only Toiveled.
The OU secretary who answered you is wrong.
There is no reason to accept the company’s representation that it is only vegetable oil. They have incentive to say they do not use animal fat since vegetarians will prefer it. And I am not aware of any government agency that would police this, since it is all burnt up and not a food product.