Like jkoral, I'm pretty conservative. But I have used BimmerCode on a couple of occasions on my F30 335 and my OG M2.
For the M2 I coded off the warming check on the rear indicators so the annoying rapid flash and rear indicator error would stop. After a month or so when I had to drop it off at the dealer for oil change, I undid that coding so I could replicate the issue before dropping it off.
They replaced the REM and never mentioned coding or compromising my warranty, so take that for what it is worth...
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2009 328i xDrive 6MT (Retired and I miss her)
2015 335i xDrive 6MT (Retired and I dont miss her)
2018 M2 6MT (Never retiring)
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