Season the cast iron well. When in doubt, season it two more times. Crisco or vegetable oil, 400' F for 30 minutes. ( Season all the cast iron you can fit into the oven. When baking ANYTHING in the oven, use the opportunity to season a couple of cast iron pans). Seasoning is good. More is better.
Cooking: let pan heat up on medium heat, and LET GET IT TO TEMP before cooking without any oil/lube. Drop a few drops of water into the pan to test for temp. When they sizzle/dance, you are hot enough to cook eggs.
Use a little butter to cover the bottom of the pan, and roll pan to get butter up about 1/2" on the sides.
Cook eggs.
Wipe down with paper towel when done, or add some water and gently brush ( plastic bristles)...no soap, then rinse. Drain/empty. Wipe dry. Oil.
