You're in luck with the black one. The drain plug is on top of the nose drive. The grey SC need to be removed to access the oil plug.
You can get the oil at any Buick dealership or you can get it from Magnuson Products.
Remove the plug, use a syringe of some sort to suck the old oil out and refill with the new stuff.
Beyond that or maybe replacing a bad vac acuator, I suggest sending it to Magnuson for rebuild/repair.
Thanks for the help, I bought a used one and after I installed it I noticed a little oil had been splattered around the engine compartment. I wasn't sure where it came from but I cleaned it off and haven't noticed any more. I was just wanting to make sure it wasn't out of the supercharger.