A simple process, with pictures for those who want them.
http://apartmentprepper.com/how-to-make-eggs-last-longer-without-a-refrigerator/DO note that the eggs are checked for "freshness" using the simple float or sink test in a jar of water.
Also, Note that the eggs are NOT refrigerated after oiling.
There is also a report on sampling the oiled eggs after a time period of up to 2 months. They passed the test.