Jack, I hope you didn't start work on your rust problem yet. Most important is sanding off the rust. Use fine sandpaper and make sure you get all of it. Then paint the spots with Rustoleum. It comes in various colors and it's one of the few anti rust products that really works. I wouldn't put anything oily on it, it will just attract salty contaminates from the road and rust more of your car. End of problem.