This seems like a good question for David B. and others on this list.  I
like to fix old things up and use them or repurpose them.  Old fans are one
of those things.  Usually they are AC fans you plug in to the wall, but
this probably also applies to the DC fans in our vanagons.  I can take them
apart and get to the bearings, which are usually just a metal shaft in a
metal bushing.  I clean up the surfaces and lube them with some handy oil
but this fix usually only lasts a little while.  What is the best lube to
use for this situation to get the most "revive time" between service
intervals?  I assume the bearing is actually worn and not fitting correctly
and can never really be right again.  Ideas?
Edward