Smoke Coming Through Dash Vents on Audi Cabriolet

Average mileage: 122,000 (122,000–122,000)
Engine affected: 2.8L V6
1 model year affected: 1998
1 person reported this problem
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problem details
1998 Audi Cabriolet - 2.8L V6 122,000 mi,
After the car has been driven for about 15 mins and I am sitting at a light (or idle) and the motor fan kicks on, it sends a faint smoke through my vents once the fan kicks off and with that smoke, it leaves a light brown oily film. What could this be? I am baffled, to say the very least! Help! Tammy