I have all kinds of capacitors. We have a pump/motor shop, so I have to stock a pretty fair amount of them. I don't put them on my website because they're are too many to list.
The problem with adding oil or replacing oil when water gets in is temporary, because generally the oil either leaked out or water leaked in through the shaft seal. If you didn't replace that, you just put a temporary fix on the pump.
I won't work on them for two reasons. One is the oil getting on everything and second, is some folks bring in their sewage pumps for repair. I don't even want them in my building.
As far as adding motor oil, I was always told the only oil to add was dielectric oil. Vegetable can be used as a substitute. But the dielectric properties of the oil assist in the way the motor runs.