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      01-30-2013, 08:03 PM   #23
Sethism
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Drives: 2009 328i Xdrive Coupe
Join Date: Jan 2013
Location: St Louis

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The N54 is direct injection. Techron will do exactly nothing for the intake valves, as the fuel and any additives never contact them. In the VW/Audi world, many owners will simply DIY: pull the intake manifold and manually clean the valves. It costs almost nothing, but the time investment is 4-6 hours.

Running high Nitrogen fuels such as Shell V-Power is known to reduce carbon build up, but at some point, all direct injection engines will require valve cleaning.
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