I go into immediate master doubt mode when I hear dealer expert master tech Tim, Fred or anything else. It just means that Timothy the ex cold call sales guy has been on more courses that the others. It is true that an engine with direct injection (ours has direct and indirect injection) can dilute the oil but if it’s done it by an inch and you can smell petrol in it, it ain’t going to evaporate it back under the fill line. It just demonstrates his lack of experience and knowledge. If you're sure he said condensation then he’s talking about water probably which as some of the others have alluded to above and that amount will ruin your engine but you’d see that because it turns the oil milky. Petrol gets past the pistons under certain conditions but we’re talking towards a litre here. It would be better coming out if there’s any doubt about what has caused it. If the oil is still relatively clear as I would expect at 2000 miles, it’s just overfilled but if it stinks of petrol, some of that is dilution and it needs to come out rather than drained to the full mark. You should pay attention and dip the oil the day after service because now there will be an argument about who’s paying and 0W/16 isn’t cheap.