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To the OP:
The problem appears to be intermittent, ie you don't have it regularly but more so when cold starting. That is not consistent with a fuel problem, which would tend to remain, particularly if the problem is repeatable and always occurs when the engine is cold.
Chevron gasolines all contain Techron. If you use it regularly it is unlikely that you have dirty injectors, the various grades all contain sufficient Techron to keep the fuel injectors clean. If you have water in the tank, fine, but I wouldn't use a product to remove it more than one time. If you got a bad tank of gas you would likely have burned it up by now. I am a big fan of Techron, and know it from when I used to work at a Chevron fuel distributor. I am suggesting that you proceed cautiously on its use, though.
Your manual contains instructions not to use any fuel additives. After the vehicle is out of warranty, feel free to go ahead. However, using them yourself when the dealer is in the process of diagnosing a rough idle may simply confuse the issue. Your vehicle is under warranty. The dealer has noted the problem. Simply return the vehicle to them and let them do their job. If they can't fix it, find another dealer. It may take more than one trip, and that is unfortunate, but it doesn't mean that they can't methodically work through the list of potential problems until they find it. Suggest you let them do their thing. If the dealer is unable to resolve it after additional visits, you can ask them to bring the regional BMW tech rep in, and meet him at the dealer service department.
Good luck.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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