Pam will work, but it's not exactly the ideal solution. The premise is similar to the rust-proof sprays they use for cars; covering the rust-prone areas in oil keeps the moisture off, which in turn delays oxidation. A vegetable-based oil, however, is probably not the best choice for that application, since it may attract pests (as noted). I'd be more comfortable using something petroleum-based. So if you're bent on doing this, do it with WD-40.
Or do what MSD says. That's also good advice and has the immeasurable advantage of not leaving you with the job of cleaning all the crap off come spring.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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