When my Ultrapure oiled Xeno valves stuck (after a long period of no use,) I cleaned the pistons and casings with Alisyn and then bathed the entire horn in dish soap and hot water. It has been said that Yamaha oil should be used for the break in and even after that. How about Al Cass? I have a lot of that but I also have the bottle of oil that was packed with the Xeno. I will switch back to Ultrapure when I have a good amount of hours on the valves. Should I use my already opened Al Cass or open the new bottle of Yamaha oil.