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 - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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