@EZ_Toner This is just a wild thought, but when applying oil to your valves are you removing each valve from the valve casing to apply the oil? Or, instead, are you oiling the piston between the felt and where your fingers press each valve?

@EZ_Toner That’s what I hoped you would say! Perhaps you will get other thoughts and ideas from this forum. I hope so, but if not, perhaps talk to a brass instrument repair technician near you or call one if you happen to be remote from a repair shop. I understand how annoying oily or greasy felts could be especially if you play on a regular basis. Good luck in finding a solution.

@EZ_Toner This is just a wild thought, but when applying oil to your valves are you removing each valve from the valve casing to apply the oil? Or, instead, are you oiling the piston between the felt and where your fingers press each valve?