It's going inside the engine and you'll need to do an oil and filter change. You may want to rebuild the slave cylinder and the master cylinder as well.
Holy crap,I just came in from finding my clutch fluid has disappeared to a low level,I noticed on my last ride Saturday that the clutch seemed to come way back before it started pulling in the clutch,a few years back the return hole was plugged and causing issues but I fixed that and it was good till now,today I cleaned the reservoir and put in new fluid and bled it,it seems to be fine but like you I donít know where it may have escaped to,I have no leaks.
You both have a Bad Seal, at the forward end of the pushrod where it enters the rear of the engine.
The clutch fluid is bypassing that seal, and entering the engine... where it Dilutes the engine oil. This is a common problem for 1500's.
The seal is not part of the Slave Cylinder, hence must order it separately.
See Item# 15 at this link:
The seal is rather easy to change out, with the only difficulty being:
1) You need to work upside down
2) It's dark in there!... best to remove the alternator, for space and light to enter.
3) You cannot get a line-of-sight on the seal, as there's no room for YOU... must use a mechanics mirror and flashlight, to "feel" your way to remove/install the seal.
4) Need a small bent mechanics Pick, to remove the old seal.