Joseph. I dont think that you would be able to shove grease in, or at least, it would clog up the shaft good and proper and starin your motor, grease generally can only be pumped in via a grease nipple, or it will go everywhere… if you use one of those pointy ends.
SO oil I would think. No idea what viscosity. Any oil that is NOT specifically made to use in water will emulsify anyway. Does the vendor give any advice on this?
I am not a fan of oiling shafts. Others are… there is no consensus here. I prefer nylon bearings, as these are watercooled and water lubricated, cheap to maintain and pollution free.
Ashley