Maybe someone more knowledgeable will chime in, but I've always wondered why some SBs have "OIL" and some have "GREASE" stamped into the cone when they appear identical otherwise. Mine says "GREASE" and I went out of my way to find the right stuff; a Teflon infused synthetic grease, got a Zerk fitting for the oddball thread, and went to town. The first time I went to use the back-gear, I could not get the cone/spindle joint to move. I ended up heating it with a heat-gun until it freed up then ran it for a few hours with the fill screw removed until most of the grease worked its way out of the cone. It was a mess, but lesson learned; I now use Type C (ISO 68) oil in my cone and back-gear despite the "GREASE" label.