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Neither CHEVRON COMPLETE FUEL SYSTEM CLEANER, Techron or BMW's Cleaner (which in Techron) have any impact on the carbon issue since they are added to the fuel system which is then injection directly into the DI chambers, not touching or "washing" the valves and seats. I had a 08 335i and now a 13 335i and use Techron regularly to keep the injectors clean, I had the 08 cleaned at 40K miles and was surprised at the amount of carbon was built up in the valve area. Really mess.
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