I see that "3-in-1 Oil" now sells a product called "Electric Motor
Oil".  It is slightly thicker than the old 3-in-1 oil, but not nearly
as thick as 30 weight.

I've always used synthetic Mobil-1 30 weight at the recommendation of
a friend who researched it at University of Washington where they use
it on many of the machines in the audio and visual machines, recorders,
etc.  Never had a problem.  By the way, the synthetic oil isn't really
all that synthetic.  Its made from oil, but some of the components that
bind with by-products of combustion are removed.  I read up on it 15
years ago when my friend recommended it.

Bill Chapman
AMICA Memberships
Santa Rosa,CA