This failure could have been avoided: the oil pickup tube was clogged from a previous repair. The timing guides were starting to fail and thus were replaced / the shop didn’t sell the additional work of removing the oil pan to clean the pickup tube. As a result pieces from the timing guides made their way to the pickup tube and restricted oil flow. This lead to oil pressure loss and catastrophic failure of the main bearings. Net Result?: Whole engine replacement for this otherwise perfect X5.