On Fri, 06 Apr 2012 11:43:34 +0100, The Natural Philosopher wrote:

Powdered graphite would be my choice.

not good around circuit boards AT ALL.

Agreed. Some of the "denial" bombs use in Gulf War I were essentially
powdered graphite, air burst over grid switching centers and
substations with open transformers etc...

Not sure how a sintered bearing would take to graphite either. It
would block the pores up so any remaining residual oil wouldn't be
able to get at the bearing surafces.

--
Cheers
Dave.