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My concern is not the dealer, nor am I concerned on that issue. I just like having the ability to do it myself as most of the local dealers are not available to do this on a right now basis, so its nice to come home just put the battery tender on and let it work while you get things done then come back and its all done. More convenience then anything.
Also my other concern is always if BMW is to update the ECU on the car while in service, that would override the "GIAC" tune in this case and therefore would have to revisit the GIAC dealer correct?
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