For preserving one for your son, and for rust protection, I found a web page that tested many types of oils and the best they found for this purpose is Eezox. I bought a can and like it. I have also used Break Free Collector for preservation and rust protection. As I recall, the web page I referred to compaired it with Mobil 1 and found Mobil 1 to be lacking. Jim
Edit to add web page: 6mmbr.com/corrosiontest.html