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Dealers make money, that's what they do. I heard of decoking an engine decades ago, 1950's or 60's, perhaps due to engine design and fuel quality back then. I know diesel generators need to be run at full load to clean the engines to allow them to operate properly when needed, it's called maintenance. But regarding BMW modern petrol engines I have never heard it mentioned apart from in this original post. Regarding diesel BMW engines you just drive them for long distances every now and then. I know with my engines I drive them hard every now and then, to clean the soot and "carbon" out of everything. And I know my mechanic cleans out the turbos due to oil residue from a over-boosting mod.
$200 is 200 dollars, you can spend it on something else, beer comes to mind.
I'd say just drive your car hard in sports mode or manual to gets the revs up and make the engine sing and clean itself as it does its job. The engine will love you for it. And remember engine speed is not to be confused with road speed, that's where the gearbox comes into play.
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