Adding oil to a pan before cooking bacon is generally not necessary. Bacon naturally contains a significant amount of fat, which will render out as it cooks. This fat is typically enough to prevent the bacon from sticking to the pan.
However, there may be situations where adding a small amount of oil could be beneficial. For example, if you're using a particularly lean or low-fat bacon variety, adding a small amount of oil can help prevent sticking and provide some lubrication during cooking. Additionally, if you prefer your bacon to be extra crispy, a light coating of oil on the pan can help achieve that result.
Ultimately, whether or not you choose to add oil to the pan when cooking bacon is a matter of personal preference. Experimenting with different methods will help you determine the approach that yields the best results according to your tastes.