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Doug wrote:
: paths for cooling and radiator). Also consider the FAA certification,
: the FAA may require the engine to run without the anti-freeze coolant
: (leaks out), but FAA doesn't require engine to run without oil. So oil

Actually, I believe that a certified aircraft engine has to run
for a certain period of time without oil, and still produce (albeit
decreasing) power.

Nope. It has to run all the requirements on 1/2 oil capacity. There are no
"no oil" tests nor any "run to destruction" tests. About the closest thing
is that the engine should not catch fire, burst, or exceed the loads allowed
by the engine mounting in the event of such a situation. This is shown
by analysis rather than a specific test.