These pans truly don’t need oil, butter, or fat of any sort. True to the paperwork it comes with, if you use any of those things, that’s alright as well but you’ve got to cook with them, use them over low heat. I literally have done it both ways and each time after the pan cools naturally, I use my sink sprayer to wash every bit of residue or food out and I can sponge it clean after. They’re fantastic pans and I’m so pleased with the price I paid.