Beckman Optima XL-90 Drive Spindle Oil

I had to remove the spindle from our ultracentrifuge to replace one of the cooling fans mounted to the shroud around the large heat sink on the bottom of the chamber. A student walked by and tipped over the spindle motor after I removed it. An unknown quantity of oil spilled out of the top of it. I need to know what quantity and what type of oil is used in it. Can anyone here advise me on this?