I've heard that as well. Guys taking pump sprayer bottles, filling them with used oil, and then going to town every winter or few months.
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Do you have access to a sandblaster?

well this spring I am gonna cut it out, and replace it. I don't drive the truck anymore ( they salted the roads)that rust isnt that bad. make sure you grind to bare metal though, and also the back side. Somehow moisture is getting into that crevice, so if you can, you should try to get to the source. Its probably just the back side. Once you grind off the rust, you need to seal it (from the back side). Dont wait until summer, it only grows bigger. Ask how I know.![]()