I do not believe any such thing (repair manual) exists...at least I have never seen one. You are really on you own (or using help from others more experienced) here. As far as items like "light oil" are concerned, in reality almost any motor oil today (30 wt, 10-30, 10-40, etc.) is likely to be of better quality than any oil from 1909. As these runabouts are total loss oil systems, I wouldn't spend any money on quality oils, they don't recirculate in the motor, they just burn or drip away. Heavy oils were for gears. As I remember, oil is added to greased joints (the universals and the differential) as the cars were operated to keep everything soft there. Critical to keep lubricated is the large pinion bearing at the front of the differential.