Re: Oil for sintered bearings
As others have noted, the traditional pre-installation treatment for these kind of sintered 'oilite' bushes/bearings [as used in their millions in 1940s-1970s car dynamos, starter- and wiper-motors] was SAE30 engine-oil.
Either stand the bushes in oil at ambient-temperature for 24 hours before fiting, or stick them in a pan and heat the oil to 150 Centigrade for a few minutes (to expel the air in the pores) then allow everything to cool so the oil draws-into the pores of the bush.
In the case of old car-dynamos the '3000-mile service' instructions involved squirting SAE30 oil into a hole in the casing to lubricate the bush.
These days SAE30 oil is a niche-market item, generally specified for old-style lawnmower Briggs and Stratton engines. My Honda mower demands 0W-30 fully-synthetic oil!
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