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I have an oil fired furnace with a power vent unit. when the furnace is running I get a slight smell of what I believe to be exhaust fumes. The system is about 10 years old, I started smelling it about 2 years ago, last year the system was fully serviced professionally and they found no problems. Everything seems to work fine, the power vent works fine, no excess smoke, I added extra co detectors around the house and have had no alarms. any ideas what this could be if it isn't exhaust? The only thing different is my oil tank was moved into the basement so I switched from kerosene to #2 oil about 3 years ago. thanks for any input.