I went to a hobby shop and asked for the lightest grade of silicon shock oil for RC cars. I paid about $6 for a rather large bottle of the stuff. I read on various boards that it works well as a chamber oil so I thought I would try it. I have 5 springers that shoot from 500 to 950 fps. I tried it in every one of them. Two drops, work it back and forth, then fire five shots to clear it out. No dieseling in any of them. Two of the five picked up about 10 fps, the other three showed no obvious change. I shoot a lot. If I treat a gun after a tin of pellets, I should have enough oil for about 100 years.