Yes, BMW does build troublesome car engines. But, so does everyone else.
The early Camrys and 4Runners had a V6 that loved to chew up headgaskets, for example...
Chrysler’s Turbo III engine had a twin cam Lotus head that ate through timing belts at 30,000 miles.
To this day, Ford’s SOHC 4.0 V6 has a rear mounted timing…