Is there any truth to coating eggs with oil, placing them in the cartons upside down and then not storing them in the refrigerator - will make them last a few months???
Conceivably, as the oil would block the pores in the egg shell and prevent evaporation/contamination. However, the oil would also eventually absorb in through the shell, so I would certainly avoid using mineral oil as some sites suggest, as it's toxic.
Having said that, I'm not sure of the logic behind storing them upside down.