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FWIW, back in the good old M20/M30 days, the standard procedure among the enthusiast crowd was to run the tank down to about 1/8 full, dump in two 20oz bottles of Techron, and proceed to flog the car ruthlessly for ~30 miles, then change the oil. I can confirm that this had pronounced positive effects on my old 533i.
While I suspect anything this drastic is unlikely to be necessary with something as modern as the N5x engines, there are certainly deposits in the fuel system after years of use. Anything the cleans them out will be helpful, even if it doesn't produce discernible effects.
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Life's tough. It's tougher when you're stupid. -John Wayne
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