One of the BMW TSBs is here:
http://www.bmwtis.com/tsb/bulletins/...p/B130206g.htm
Note that it says to use good quality gasoline. If you can't do so, the 20 oz bottle of Techron is second-best.
I have worked on engines that had an additive poured in, to fix a problem caused by a build-up of deposits. The result was that the deposits were cleaned out, but didn't make it out of the engine. They caused consequential damage to the engine. It was an expensive fix for the owner, involving engine disassembly.
I stand by my previous recommendation: use good quality gas. If you can't, use a Techron-based additive, but realize that they are not without risks.
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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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