"The rollers look to have a rubber inner core."
Uh, as rubber in an excellent insulator, this would make them just "rollers", with no "pickup" involved.
Yes, any metal-to-metal moving parts benefit from oiling, and as pickup rollers are just funny-looking little wheels and axles, they definitely need lube - maybe more than most wheels, as they have a small diameter and therefore turn much faster than everything else rolling down the track.
Any light oil will do. 3-in-1 is what I tend to use. Never had any oil block electrical pickup on my rollers.
Don't use graphite dry lube.
