2015 BMW 650I Power Train Problems

VEHICLE IS EXHIBITING AN INTERMITTENT VIBRATION THAT APPEARS TO BE COMING FROM UNDER THE VEHICLE AND CAN BE FELT IN BOTH THE DRIVER, PASSENGER SEAT AND CENTER CONSOLE WHILE DRIVING AT HIGHWAY SPEEDS. TOOK VEHICLE IN TO THE DEALER TO DIAGNOSE PROBLEM. GENERAL MANAGER AS WELL AS SHOP FOREMAN DROVE VEHICLE TO CONFIRM ABNORMAL VIBRATION AND SCHEDULED SERVICE. AFTER SEVERAL ATTEMPTS AT DIAGNOSING PROBLEM, I WAS TOLD THAT THE VIBRATION IS NORMAL WITH THIS MODEL. THERE ARE TWO PROBLEMS WRONG WITH THAT ANSWER, 1) IF THIS IS A NORMAL VIBRATION, THEN WHY ATTEMPT TO DIAGNOSE THE ISSUE IN THE FIRST PLACE? AND 2) SINCE THIS IS NOT A NORMAL VIBRATION, BEING THAT IT IS STRONG ENOUGH TO BE FELT INSIDE THE PASSENGER COMPARTMENT, WHAT OTHER COMPONENTS OF THE DRIVELINE ARE BEING AFFECTED BY THIS VIBRATION AND HAVE THE POTENTIAL OVER TIME TO HAVE CATESTROPHIC FAILURE? THE VEHICLE IS UNDER FULL...