Sudden total loss of oil pressure while running ... i would at the very least check the rod and crank bearings before attempting to start the engine. but imho they are already fubared. Trying to start an engine with fubared bearings means you may also have the rods and crank to change.
Your choice ...
Oil pressure allows your crank, rods and block to not contact each others. As soon as it is gone, they will rub.
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