Fork Oild instead of Mineral Oil for the Clutch

[mondrage]

Had to change the mineral oil on my K12S. Got a new Oberon slave cylinder, and a new master cylinder.
Couldn't find my bottles of blue mineral oil, so I used 5W fork oil.
Is there an issue?
It's just oil, right?

[802Mike]

Mineral oil is more refined. Not sure if that would make a difference.

[mondrage]

working fine... but I still have some fade on the clutch lever when revving very hard.

[jpel]

Fork oil is also hydrophilic meaning it will absorb water. Ya might want to flush it out and replace with mineral oil.
Jim