I have a 1970's Olds Ambassador that I find easy to play except for sticky valves. I cleaned throughly and tried a variety of oils. Noting did any good until I tilted the horn to the right. The valves NEVER STICK! I have other horns that I play in my usual up right position that don't stick. So I don't blame my finger position except on this Olds. I don't know if it's technique sensative, or if the valve casings are worn in a way where tilting to the right frees the valve return better. It really sticks when tilted to the left! I'm not nuts, this is how this horn is behaving. All comments welcomed except MAN YOU'RE CRAZY!