oil the slave cylinder?

I noticed on top of what I believe is called the clutch "slave cylinder" (not that I really understand what that is...but its right where the clutch line reaches the engine) there is a little "grease" fitting...well, actually a fairly large one, bigger than the ones on the levers anyway. It has a little rubber cover that says "oil" on it. What is this about? I don't find a mention of it in the factory repair manual...What sort of oil?..how?...when?...what does it do?

Yes the clutch uses hydraulic oil SAE10 i think not brake fluid.
You can use fork oil i believe.

Did you get spare parts books with your bike? If you did, look in the back of the book for the clutch back bleed kit and the mineral oil. Only use KTM mineral oil

whare to send it. It's orange....