"Martin Eastburn" wrote:

Sometime during the night the engine block cracked -
I think it was fatigue and the oil drained out. Once the
black stuff got out (liquid smake ?!) it was all over.
--------------------------
May have also been corrosive by products of combustion that weakened
housing.

That was the basic reason for frequent flushing.

BTW, I threw a con rod that had worn egg shaped.

Lew