When was the last time the coolant was flushed?
You can pretty much expect to see crap in the cooling system if the coolant is ancient.
That's not to say you "can't" have a head gasket leak, or a crack in a casting, or whatever. It's just that I wouldn't panic about it unless you know for a fact that the cooling system has been maintained to factory specs. If not, (and that's extremely likely) I'd be looking at ways to properly and completely clean it and see if the sludge returns.
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For the good of the Free World, DEMAND COMPENSATION FROM CHINA for their release of the Virus Originating in the Wuhan Laboratory, released (intentionally or negligently) into the world in 2019 (VOWL-19). Ten trillion to start with, increasing as needed from there, PLUS compensation for the sickened, and "wrongful death" settlements for the families of those who didn't survive. END trade with Communist China.
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