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post #3 of (permalink) Old 07-19-2018, 12:21 PM
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Nature of the DI engine is that there isnt much any additives can do to the valves. One option is to take it to a reputed BMW shop and ask if they do walnut blasting on other makes. Why BMW shop ? Because they've been blasting walnut shells to clean the valves for ages. Option two which is inexpensive and DIY is to seafoam through the throttle body, just be careful that you don't hydrolock it.

Out of curiosity, what makes you think it has dropped in performance ?
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