you change the oil in them every XXXXXX miles (oem fill on the M112 eaton used on the 03/04 cobras is 100k miles)
thats pretty much it..... with a supercharger though you get more oil forced back through the pcv system so many use a oil collector to keep as much as they can out.
Thats pretty much it~ there is an extra cooling system (liquid cool like the regular radiator) that you change just like the normal coolant interval or so~
I would not install an Eaton brand supercharger (roush has used these not sure if they do) it would be MUCH Better to go with a ford racing whipple or kenne bell kit (google Root vs Twin Screw as the OEM roush uses root vs a whipple/kenne bell that is twin screw, and twin screw is far superior)