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You are much better off using good fuel, with sufficient additives, but as that is not always possible there are additives available to correct problems associated with the build-up of deposits. BMW recommends not using additives, but they acknowledge the need in some cases. I just wouldn't ever use them as a preventative measure, given the other problems they can cause.
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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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