I believe nichrome is highly resistant to oxidization, so it probably doesn't need a protective oil film but I have never seen how wire is made... perhaps oil is used during the process of making it into a wire.
Correct. Nichrome is very resistant to oxidation. If it did oxidize, we would be in a world full of hurt.
Oxidation of Aluminum = Alzheimer's (so it's thought but who wants to take the chance by heating aluminum and inhaling it?)
"There is a strong connection between aluminum and Alzheimer's disease. Research clearly demonstrates abnormally high accumulations of aluminum within the brains of Alzheimer's victims. Independent studies performed in Norway, the United Kingdom, France and Canada, show a direct correlation between the prevalence of Alzheimer's disease and aluminum concentrations..."
You can google scientific claiming it does and doesn't. Still who wants that chance?