The motor should be oiled once a year - with one small drop of the supplied oil only. A syringe of this oil is included with a new turntable. If you do not have one, you will need to order it from SME or an SME dealer.
SME warns against over-oiling: one small drop.
I very much doubt that you need to worry about the small amount of oil that seems to have emerged from the motor shaft. It may in fact be left over from a clumsy attempt to apply the oil on the part of the previous owner. It is, in fact, not at all easy to stop too much oil coming out of the syringe. Best perhaps to apply it first to the blade of a small screwdriver and then transfer it to the duct leading to the motor shaft.