Smoking from where? Under the hood? Tail pipe? If the smoke is coming from under the hood, oil probably ran down when the valve cover was off and got onto hot exhaust parts. That smoke will gradually go away. Normally mechanics will wash the area of oil residue when they're done, but oil and the cleaning chemicals can pool in hidden places, then get hot later when you drive the car, and start to boil off.
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Thursday, November 29th, 2012 AT 8:31 PM