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Diesel engines tend to leak oil into the coolant when the oil cooler fails. My ford powerstroke did this, one trick diesel mechanics use is to drain all the coolant, replace it with water and then add dish washer detergent, Important: the not the suds or foaming kind (NOT THE KIND YOU USE IN THE SINK) the kind that goes in a dish-washing machine because it will not foam (I used Electrasol). Then drive around for a while and get the engine nice and hot, the detergent will break down the oil just like it does with the grease on your dishes. You can then flush a few times with clean water before replacing with new coolant.
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