Mikem,

You make some good points. The main issue I have is simply whether it
is better to run the engine and oil the parts, or just let it sit.
Someone posted that where they live, that many times flying is not an
option for weeks at a time. I completely agree that flying for an hour
or so weekly is the best thing, but I have had times during the winter
when short days and drizzly crappy weekends have made getting in the
air dangerous when my schedule has allowed it. I know what the effect
of moist air against bare metal does. What does the coat of oil from a
ground run do to the metal? I seriously doubt if it is as bad. I would
like to know if anyone has actually measured the acidity or moisture
content of the oil in such an instance? As I stated, my oil analysis
always shows no moisture; none! And I ground run the engine alot.
Glad to hear your comment about the exhaust system issue. I
wouldn't be surprised if the advice about not running the engine up to
temp on a car for this reason, was the beginning of the advice not to
do the same for airplanes. I wonder what it does for our mufflers given
they are designed differently. Those puppies get hot quick!
It would be a shame to trash an engine trying to save an exhaust! .

Rusty