Also pay close attention for any continuing oil fume smell. Many years ago I visited a friend that had oil heat. I mentioned to him that I could smell a very faint "diesel exhaust" odor in his house. A short while later I got an email from him, thanking me for mentioning it. He either a) hadn't noticed it or b) had become used to it. He had a furnace guy check things out and he discovered a cracked heat exchanger that was letting part of the exhaust into the house.