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While it's not in the service booklet bmw dealers definitely do valve adjustments on Z4Ms every 30k miles as part of Inspection I. Whatever documentation the dealerships have must say it's required. Mine is an 07 and had the 30k mile and 60k mile adjustments done under previous owners at the dealer.
That said the dealer that worked on my car didn't do a good job and when I had a very well known S54 tech do my vanos replacement he checked the valve clearances and several were out of spec.
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