What Oil For Enco 12x36

I am trying to figure out what oil to use for changing the oil in my Enco 12x36 and have decided that I am confused---(nothing new there) I think the spindle and gear box use the same oil and the apron is different. The owners manual that comes with the Enco is just about useless---just says machine oil.
Can someone enlighten this grumpy old man?

Thanks,
John