As engineering technology improves and competition increases, OEMs & suppliers are able to design their parts w tighter failure margins. IDK what BMW’s parts specs are regarding MTBF, but 100kmiles might seem reasonable.90k miles is tops for any modern German car
GM traced the problem back to one of its cylinder head suppliers. By analyzing heads returned under warranty, it was discovered that some weren't machined properly. On these LS7s, the valve guides and valve seats weren't concentric, which led to severe wear of the valve guides.Here is a 570 HP LS7 that blew up as a contrast..I think I'd like to try this motor in a car one day.