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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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