FWIW my X5 has failures so often I keep a code reader in the vehicle. Same thing for my e60 and the E39 before. Last reliable BMW I had was an e34, and that was less reliable than my e28 and ditto all the way back to my E3’s and 2002’s, which were incredibly reliable and cheap to maintain.

All my wife’s Merc’s over the last 35 years have been 5x better. At this rate even Porsche and Jaguars will be more reliable than BMW.