block oil cooler perforated would be my guess so id be leaving everything else alone until you do a pressure test on the cooling system.
my method would be to fill the cooling system with dye coloured water then pressureise to 15 psi with the sump plug out.
if it leaks out of there the next step is to pull the glow plugs and do a compression/leakdown test
that will get you closer to an answer. its pretty rare for these engines to do the headgasket or suffer a head failure.
you could have unseated a liner or had a rust through on the block at the bottom end.
the oil cooler is mounted in the block on the RHS in a removeable panel under the inlet manifold
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