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How can I prepare car for winter in terms of anti-rust protection?

Someone told me that I can spray car with mix of ATF and WD-40. This way oil can creep into all the small places in car's body and protect it against rust.

Is it true? Any other suggestions?

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I believe that you can do that, but you're probably better off buying a properly formulated anti-rust product such as 'Waxoil' or similar. These can either be sprayed or brushed onto the underside of the car depending on the product in question.

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I'm told that "Waxoil" is the best, but I've used LPS-3 Rust Inhibitor with pretty good success. –  Brian Knoblauch Oct 2 '12 at 18:03
Does Waxoil wash off? I head that anti-rust protection that hardens will eventually (after few years) crack and water will be accumulating which leads to accelerated rusting –  MeIr Oct 4 '12 at 2:25
IIRC Waxoil do two versions, either the thicker paint type that hardens, or a thinner oil that doesn't harden, but needs to be re-applied each winter –  Nick C Oct 4 '12 at 10:19
I see, thank you. –  MeIr Oct 4 '12 at 11:06

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