I just opened a 1980s Sachs Torpedo 3 Speed hub with coaster brakes. They are alway greased and works after decades of abuse, "works" is very agruable as the decades go by, shifts, turns but seriously slow and far from smooth and light running. This hub is an argument for spending a lot of WD40 if it's not going to be opened up, the hub is sticky, grease has dried up, lots of grime and grit probably due to the coaster brake. Repeted flushings of WD40 will probly help a lot and do more than the regular lubricating oil. The old oiled hubs are usually never this bad, it's mostly the greased coster brake hubs, maybe greased hubs in general.