umm, yea,try reading again, cuz i said no n62 x5 motor has a water cooled alternator. so i wasnt wrong. not by a long shot. there is a difference when comparing it to the m62tu motor. ive worked on plenty of vehicles with bluetooth problems.

Majority of the concerns are bluetooth does not work any more.

I have only encounter less than a handful of problems with supported handsets not pairing anymore, but ALL of thoes were due to a hardware failure Fault Code 79. Removing the TCU, the tcu is warm not hot when replacing it.

The customers with unapproved handsets that come in after a couple of months of use, come in. First check the fault memory, no communication with TCU. Remove covers from TCU. and The TCU is HOT to touch. Disconnect tcu and reconnect, Tcu now communicates. Delete paired phones, allow vehicle to go to sleep, Re-pair approved phone. Send customer on Their way.

Multiple BMW service bullitins state this

Note: Pairing on an incompatible handset can have adverse effects.

Tcu's replacments need authorization from BMW for approval. When asking for approval, all information is requested such as bluetooth handsets paired, It is almost unheard of that a customer will have to pay for a TCU under warranty. Ive spoken to the head of the TCU group in NJ, and he even says that un approved phones can cause the TCU to overheat and looses communication over K-BUS. This is because the TCU is constantly looking for the phone and does not power off.