Stainless steel cookware does not necessarily require oil, but using a small amount of oil or fat can enhance the cooking process and prevent food from sticking to the surface. While stainless steel has natural non-stick properties, adding a bit of oil can help create a barrier between the food and the pan, making it easier to flip or remove food without any hassle.
Additionally, adding oil to stainless steel cookware can aid in browning and caramelization, as well as enhance the flavor of certain dishes. It can also help distribute heat more evenly across the surface of the pan. However, the amount of oil needed will vary depending on the recipe and personal preference.
It's worth noting that using excessive amounts of oil in stainless steel cookware may lead to oil residue buildup or splattering, which can be challenging to clean. Therefore, it's generally recommended to use a moderate amount of oil for cooking in stainless steel pans.