This is a better picture of the tube. If I fill the oil to the max line on the dip stick and then drive 500miles, the level will be just above the min line.
Upon inspection there is a few drops of oil on the sump to engine bolt that is directly under the switch. There is also a few drops under the sump drain bolt. The oil is also sprayed slightly over the catylic converter and some of the sub frame. I have checked the tightness of the drain plug and the sump to engine bolts.
I presume the rubber tube is the insulation for the wire to the switch contacts.