Occasional oil smell
My house has an oil forced air furnace. On two separate occasions (about a week ago and last night), when the furnace came on, I noticed a faint oil smell. I don't know what the furnace exhaust smells like, but I am familiar with the smell of fuel oil. This seems to be the smell that is coming out of the ducts. Additionally, this smell seems to be strongest in the basement near the oil tank. I did a quick visual inspection of the tank, line, and the floor around them looking for any oil spots, but saw nothing. I will be making a service call with the heating and cooling company tomorrow. If they prove to be as useless as they have been in the past, I will also be making a service call to the oil company. Do any of you experts have any ideas what this may be caused by, or if there is great danger? The smell seems to disappear almost as quickly as it appears and really is baffling. Thanks in advance for any help!