If it is an Eaton M90 supercharger, I have been told that it is not neccesary by several differant sources. It is a sealed unit, and internally lubricated for the life of the unit. I know that is hard to swallow, but I think this is what you will find out.
Not sure what Saleen recommends on that though I did find this info from the SC T-bird forum and something from the Eaton website (nothing that specifically says change the fluid at XXXX miles).
Fluid is typically distrbuted by Nye who packages many different fluids for use in compressor/blower systems. GM Fluid is cheaper than Ford, which is probably cheaper than Saleen.
Now, the Nye data sheet does show the correct Ford part#. From my service manual...
Quote:
The supercharger has a self-contained oiling system that does not require a fluid change for the life of the vehicle. However, at every 30,000 mile interval, the supercharger fluid level should be checked. The vehicle should be parked on a level surface, the engine cool, and not running. To check the oil, remove the Allen head plug located at the front of the supercharger. The oil level should be at the bottom of the fill plug threads when cold. If the fluid level is low, add a Synthetic Supercharger Fluid E9SZ-19577-A (ESE-M99C115-A), or equivalent.
The M90's amazing durability is the product of decades of development by Eaton. This compact powerhouse has been tested to more than 150,000 miles...without maintenance. Self-contained and remarkably efficient, the M90 is the ideal choice for making more power, more efficiently.