My friend sent his 328i for repair at a private workshop. The workshop specializes on BMWs. One of the many items that needs replacing is the vvt motor. I said maybe the guy is referring to the valvetronic motor, my friend then said vvt motor and valvetronic are 2 different things. The technician told him that valvetronic is related to the propeller shaft.
As far as I'm concerned, valvetronic is BMW's variable valve lift technology working together with the VANOS system (variable valve timing). Nothing to do with the propeller shaft.
This makes me wonder if the technician is talking bullshit.