I am planning to change the oil i the supercharger. Based on my research the XJR/6 comes with Eaton M90 supercharger. How many CCs of oil should I fill? I went through the factory manual, but can't seem to find where the procedure or supercharger oil capacity is mentioned.

 

3 US Fluid Ounces.
Here is a nice little video by XJ Jesse on YouTube for the procedure on replacing the coupler if it’s worn. As well as replacing the SC oil.

 

Fill it until the oil comes up to the bottom screw threads.

you can find the service bulletin here:
http://www.jagrepair.com/images/TSB/...percharger.pdf