I have to take the entire fitting nut off....Thats whats stuck. I tried looking for an adapter at home depot that would go into the stuck nut, and then also fit the oil line, but the one that looked like it might work, they were out of, so I need to go to another one and see if they have it.

All im not sure about is if the stuck nut is supposed to be at an angle like that. If it isnt, that means its cross threaded, and I dont want to take it off, because then I wont be able to put the new one in anyways.