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I would still highly recommend checking the coolant system before you go too far.
That oil definitely has water in it. Probably several quarts at least.
Coolant in the oil will eventually delaminate the main and rod bearings if run too long, so hopefully it's recent.
You are correct about stuck...
Definitely looks like coolant in the oil, however.... there are always other possibilities with "auction" equipment.
Could have been a flood victim, you never know, assuming you never saw it in "Good" condition from what I'm hearing?
Change the oil and filter, pressure test the radiator and see...