This weekend I am working over my lp tank, getting it ready to have the
valve (and now certainly the regulator) replaced.  Taking things apart I
found some thin but very dark (black) grease in the bottom of the regulator
and inside the 3-way fitting on the end of it.  I was under the impression
that you should not have any grease or oil in the gas delivery.  A search of
the archives didn't turn up any mention of this before.  Is this a sign of
something else?  Should I suspect that this grease could have gotten as far
as my fridge?

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Not all those who wander are lost