Please post pictures if you can. Some 3 in 1 oil will prevent rust just fine. Cooking oil can go rancid. Just apply a thin coat with a rag and wipe off the excess. A thin film of oil is all you need. There are also silicone impregnated cloths for around five bucks that you can buy for guns and fishing gear that will do the job as well.
__________________ “If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams