Clutch Bowden train oiled outside

Servus municipality, for some time now the clutch bowden train of my TC88 is oiled outside – the oil drips properly below the crankcase, looks like gear oil. After the gear oil in the clutch actuation Mimik inevitably has to run into the bowden train, only a leaky sheathing of the train remains. Do you know such a thing and/or do I really lie with my guess ? Already thank you for the help. best greeting TGV