Broken oil pump chain...
I saw that engine in person today - my friend and his mechanic were busy swapping it for a good used one (at least we hope so). The seized one was on the engine lift with the oil pan off - it looks like it lost the oil pump chain - got some photos of it. See below.
So that kind of makes sense... the oil chain broke which lead to oil starvation which killed the main bearings....
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1987 Mercedes 300SDL; SOLD
1985 Mercedes 300D; SOLD 
2006 Honda Pilot - wife's ride; 122K;
1995 Toyota Land Cruiser - 3X locked; 182K
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