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Fuel additive does not work on the N54 since it is direction injection, so the fuel never ever touches the intake valves.
The engine cleaner sounds more promising since it is injected via the vac line, but I'm not sure how useful it is as something other than preventative maintenance. The guys at E90 post had to do some hard scrubbing to get the gunk off.
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E82 135i M-sport: SGM/6MT/Black |