Brian,
All the advice so far is good. It is extremely unlikely to have a porous
block. If so, you would have noticed by now.
A very unlikely situation that happened to me is a leaking soft plug. One of
mine on the passenger side near the oil filter actually rusted through from
the inside. The mechanic at the independent garage I go to for servicing
found it while searching for the answer to the problem I was having with
goofy temperature indications.
Neil
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