i used the techron helping some carbon deposit detected at inspection (bought at the stealers)
At every oil changed they reco

Here is an official letter from BMW source : this site

http://www.xoutpost.com/attachments/...detergency.pdf

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2006 X5 4.4i premium, Sport package ,Winter Package, Sat Nav. AFE Power stage II Production : 08-2006
2012 BMW 128I Convertible Black
2011 Mercedes Benz B200 sold