Mod... please split the SC oil posts for us. As this is a whole nother topic and should be discussed at length.
The additives, oil'* themselves and everything about them is completely different from Mobil 1 to GM SC oil.
The original manufacturer, rebuilder, performance vendors all agree that GM SC oil is the only oil to be used in the supercharger. PSE is the first rebuilder I have ever heard of suggesting something else.
The cost isn't much different for the small quantity needed and personally, I wouldn't take the risk.