I've had my ovens rust on rainy and snowy trips.
Are you 100% confident that you have a good seasoning on your cast iron pieces? Even just giving them a quick rub with cooking oil will help prevent that.
I would suggest using mineral oil. Vegetable oil or animal fats will turn rancid with time. Mineral oil won't. We used a light coating of mineral oil after cleaning all our cast iron for the past 15 years on our chuck wagon. It is rust free.
Always dreamed of owning a chuckwagon. I just don't have the time, space, or money to invest in one. Do you compete in chuckwagon events, catering, or use it on a ranch? For those of us who love outdoor cooking there's something special about the sight of a chuckwagon.
Joanne
I don't go that high in temperature for it to matter. Doing what I do for a living, I'm looking more at the chemical nature of the oil, the open carbon double-bonds.May have to try Flaxseed oil... I've used peanut oil in the past based on the suggestion that its higher smoking point than vegetable oil is a good thing. (over 400 vs 225 or so)... Any truth to that?
Dan