Purpose:  Not only is this something that should be done once a year, and its very easy to do.  Often from the factory they come under-filled and you will find that they come with the most VILE smelling oil known to man.  It is NOT synthetic oil as some dealers suggest, but a very specific oil made for our superchargers. 

How its done:

Parts:

• You will need two bottles of GM supercharger oil, GM p/n: 12345982
  
   

Tools:

• Turkey baster

• Short hose- needs to fit over end of turkey baster, and in s/c plug, about
  6" long.

• 3/16 Allen wrench or hex bit
  
  NOTE: Make sure that your engine is cool before starting this!
  
  1-Unscrew the super charger oil inspection plug (a black plug at the front of the
  super charger snout using a 3/16 hex head).
  
  2-Insert the tube (that's attached to the turkey baster in to the hole and suck out as much oil as you can. This may have to be done many times to remove as much of the oil that you can. Dispose
  of your old/used oil with your old motor oil in an environmentally SAFE manner.
  
  3- Add the oil until it fills the snout to the bottom of the threads. It will take almost two bottles. Be careful to NOT overfill!
  
  
  4- Screw the plug back in and do not over torque.  8-12 ft/lbs is more than enough!
  
  5- After driving around for a day or so, check the oil level while the car is on a level surface.  It's also a good idea to check the level of your supercharger snout at every oil change.
   

Credit for the original text (I changed it a little to clarify it to my personal tastes) comes from David Singley.

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