If it is too thick to circulate through the radiator, it will overheat.
You could try removing the thermostat so water will circulate freely, start it up, bring the RPM up some, open the drain valve and feed water in with the hose. Once it is circulating, add some Dawn dish soap, let it circulate then flush again, may need several repeats. Once flushed put the thermostat back in, run water only for a test period, see what happens. If diesel don't run it under heavy load until the proper coolant is replaced.
If it was an overdose of stop leak, the leak will probably return but the goo will be gone.
If it is oil the problem will slowly return.
If overheating continues it could be a head gasket or cracked head.
Is there any evidence of water in the oil? Condensation under the oil cap, in the dipstick tube?
Typical sources of oil in the coolant are failed oil cooler, head gasket leaking where oil galley to the rockers passes through, cracked block in rare cases.
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Today's Featured Article - Restoration Story: 1929 McCormick-Deering 10-20 - by Randal Simmon. On July 4th 1998 my dad and I was sitting on the front porch when he said that he was going to sell his two 10-20's to a junk man. He said that the junk man was going to give him $500 for both of them but he hadn't received the money for them yet. So I went into the house and wrote him a check for $500 and bought them myself and said now they are mine. He had bought them about five years before thinking that he was going to restore them himself. After five years sitting in the barn, he changed h
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