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Probably nothing. Oil goes through the engine but doesn't get completely burned in the combustion process and condenses on the pipe or oil on the crankcase walls and crankshaft drips to the bottom of the case. When you start it, airflow pushes that oil out the exhaust. If it's really excessive, your oil pump may be set a bit high. (Just remember, oil is cheaper than parts are!) Some oils burn better than others, too. Switching to a different brand may help a little, but will not eliminate the symptoms.
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