If you are 100% sure it is engine oil then I would bet that you have a broken piston oil ring. It is allowing oil past the piston and it is not burnt running under low load. Work the tractor and if it cleans up but you still loose oil then it is a broken/stuck piston ring.
Usually black fluid running out of the muffler is unburnt/raw diesel fuel. It is black because it washed the carbon out of the exhaust. It is caused by several things: low compression, bad injectors, too cold of engine temperature, injection pump turned up too much. These are the common causes.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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