I rarely lube my folders. Rarely as in if one gets totally gunked up--ridiculously so--I'll give it a Marine douche with WD-40, work it out, then wait a week for the smell to go away . It'll work fine for a while after that. Last time I did that was about '07 on a '99 Masters of Defense I'd taken on an outdoor trip. I've never done it with an Emerson yet. They are too easy to just take apart and clean if they get to the level of nastiness I consider needing 'lube.'
Knives attract far more dust and lint
that stick when lubed vs. dry. When I DO lube I use an obscure sythetic dry lube (applies wet) used mainly for bicycle chains. PTFE I believe....
We arent dealing with the pressures, gases and temperatures of firearm operation by any means, therefore no need to enter the firearms realm for lube/preservation, etc. Any good lubricant will suffice for a folding knife.
Emersons are ready to go out of the box...sub-arctic or rain forest mud bath. Whatever they use is fine with me and I've always considered it permanent; at least until I can see the washers wearing out (which hasn't happened).
IMO, Emersons aren't, and will never be "flickers." I'd never expect to get William Henry or bearing-like smoothness out of most Emersons. To lube just to reach that last 3% one might attain on a custom folder seems to me to be moot with an Emerson.
As to Emerson not knowing what the lube is....like it takes anymore than a shout to the plant where George and Martha are applying the lube to new washers and asking them what the hell the label says? Who did you talk to there?