OK just found a new version of the Crafting Recipes guide. Someone just posted about the oil and armor after I posted mine here so maybe they just found it also or saw my post and tried it. Either way it wasn't one I knew. Still their post does point out something good about this in that it can be done anywhere without the need for an anvil. Now that I think about it if it does the exact same thing as using the armor on the anvil that's why my other two pieces didn't do anything adding oil, they had already been hammered.
