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Can you use rancid oil to season cast iron?

Hello, folks! I'm been lurking for about a month or so and I must say that I absolutely love these boards. You could go mad trying to read through the sheer amount of info stored on these boards. That said, this is my first post here, so please be gentle.

With that out the way, I'm looking to get into cast iron cooking and I was wondering if I could use flax seed oil that has gone bad to season cast iron cookware. Not using it to cook or anything like that, just the direct oven method. I ask this because it is my understanding that flax seed oil isn't exactly good eats or even a good cooing oil, so I'll only be interested in using the stuff for seasoning. With such a low amount that I'd be using, I'd imagine that it's likely that a bottle of flax seed oil would go bad long before I could go through it.

Also, it would be nice to be able to just throw the stuff in the pantry in an air-tight jar or something instead of taking up variable fridge space.

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  1. Check out this thread, it's long but a lot of experiences are described: http://chowhound.chow.com/topics/757023

    1 Reply
    1. re: SanityRemoved

      Oh yeah, I think I should have just posted that on that topic. My bad.

    2. Just to play it safe. why not use non-rancid oil?
      The cost is minimal.

      3 Replies
      1. re: mpalmer6c

        +1. I agree to this. I also think the flax seed oil seasoning has been reported as very functional by many here. Though the method actually has minimal impact in the long term.

        1. re: Chemicalkinetics

          @mpalmer6c - I've never been one to like to spend money when I don't have to, so I was trying to see what my options were.

          1. re: shezmu

            :) Not sure who you want to talk to. Either way, my suggestion is to use regular cooking oil. Not extra virgin olive oil of course.

      2. I'm sure you could, but why would you want to? Your food would taste like rancid oil.

        1 Reply
          1. I believe this is a matter of false economy for dubious savings.