what to use? GM or something else?

 

Gm...

 

You rebuilding your supercharger? just asking because I dont believe you can add any unless you are.

 

AC Delco or GM. You can drain and refill your oil without rebuilding it.

Jeremy

 

If you have the SC off of the car you can access the fluid fillers.

 

Yup....even the MINI guys go to GM to buy the oil (we were even told this at a club tech event at a RI MINI dealer)....MINI does not stock/sell it, and many GM cars have used Eaton SC.....it is the same stuff that the SC was sold with. I would not trust the E-bay stuff...might be ok...might not. The oil from GM is pretty cheap, and the SC so $$, IMO it is not worth experimenting!!
One suggestion...if the SC is off, do the water-pump at the same time if you have lots of miles!!