Gotcha. I changed mine for the first time right after I got the car at 70k miles.
Bubba, do exactly what the Rat said to get the oil There are 2 sources on the net for it, but by the time you pay shipping, it ain't worth it. They come in little bottles. About 10 bucks for 8 ounces, I think. Buy 2 or 3 bottles. No ****. You'll wanna flush it.
This procedure is for Series I (92-95), I don't know how much different the Eaton M90 is, so this is for the M62 (what year is your Bon?)
Pull the smaller of the two covers off the blower, on the pulley end of the supercharger. You'll see a small plug (1/4" NPT if you know your plumbing sizes) out of the nose cone assembly. You don't want it hot, but make sure it'* warm.
Put a Jack under the Front A-arm or sub-frame on the driver'* side and raise it. This will force the oil towards the pulley end of the nose cone and make it easier to suck out.
Get a large syringe from your local drug dealer or farm/feed supply, and some 1/4" tubing from the auto parts store. A foot will do. Press the tubing onto the end of the syringe, and use that to suction it out through the fill hole. Refill it with a clean syringe and tubing, not a funnel, cuz you have to see when the oil reaches the bottom edge of the threads. The last time you fill it, let it off the jack (level car) before filling it.
Good luck! You just bought some peace of mind.