I have nothing technical to add to this discussion.

However, I would just note that you are a brave man, using motor oil in a skillet in your kitchen. Or maybe you are a batchelor. I would MAYBE have used olive oil. Motor oil? My wife would kill me. When I painted my engine case and accessory housing, I "cured" the parts in the oven at low temp, resulting in quite a stink. Never heard the end of it!