2002 525I Just after recent

I had a similar problem with my 2003 325iT w/59K miles last week, right after an oil change. It did it more often when starting the car, and once or twice when accelerating. Then it stopped smoking and hasn't in several days. My mechanic neighbor suggested that it may have been too much oil, that has corrected itself by burning off. I hope he's right. I figure the smoke stopping is either a good thing or a really bad thing. No engine warning lights or anything, so I guess all is well.