Which classic Bell and Howells?

Most of them want "light machine oil" and "medium machine oil" which today
we would call "ISO 32 turbine oil" and "ISO 68 turbine oil."  That includes
the Filmoarc and the 300-series machines with the oil cups on top of the 

The 500-series B&H machines and 1500-series machines also require an
instrument grease.

Check the service manual for the projector and they will say.

A good source for light machine oil is "Zoom Spout Oil" from Ace Hardware,
which seems to be a pretty good grade of turbine oil.  It will not turn into
varnish and goo after a while like cheaper oils will.

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