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With a cranking RPM of 100, my original 37 Ford flathead would produce 60 PSI of oil pressure before it ever started. I used to crank it (starter button) with the ignition off when it sat for week or longer to get some oil circulation.
Lubrication related failures are virtually unknown in modern engines with decent maintenance.
The "ugly vibration" which should only occur in a manual is just the engine "telling you" it's time to downshift. If that communication is ignored completely, it would still take quite some time for any significant damage.
Frank referred to "lugging". In modern fuel injected engines the really dangerous component of lugging which in the old carbureted days was accelerator pump enrichment without adequate engine speed, no longer exists. I'm not saying there would be NO damage but with efi, you don't have the accelerator pump component.
Automatic transmissions work by imputs for vehicle speed and engine load, so they really don't allow lugging.
regards
mech
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