I also have been using nano-oil for a couple of months now and I am really impressed with its performance, even on my old Military the blade flies open.

I think the best performance is achieved on phosphor bronze washers, however I also used it on my custom Terzuola ATCF which has some kind of teflon washers, and the knife opens like its running on ball bearings.

Only a very small drop of nano-oil is needed, I still have my first 10cc bottle and now its about half full and I already used it on dozens of knives.