Ok-there seems to be some confusion on what, if any, lubricant to use on my folders with roller thrust bearings.
The answer is: NONE
When I finish a knife, I spray it (drench it) with WD-40. This removes the buffing compound residue left from sharpening and seals the logo etch, as well as washing away any grit that might be present (Grit in a knifemaker's shop? NAAAAAA....)
The knife is then blasted with compressed air until virtually all the oil is removed and then it is wiped down with a nice, soft paper towel. The tang is cleaned with a Q-tip and acetone, and the action is checked one last time to make sure it is perfect. This involves applying a touch of sharpie marker on the tang where the lock engages. Then, into the zipper pouch it goes.
Some customers just can't resist lubing, tweaking and tinkering. The problem with lube is that it goes places where it actually hurts the knife. Want to screw up a fast flipper? Put lube all over the lockbar and slam it open. It will probably lock up REAL TIGHT. If it doesn't, the lock was probably unreliable to start with, and will almost certainly not pass even a mild spine whack. If it locks up so tight that you can't disengage it w/o prying the locking bar out, then there is too much flex in the knife, which can be caused by many, many factors, and all of them indicate problems with the basic knife, either in the design or the adjustment.
"clean" is much more important than "lubed" if you want optimal function in a flipper.