Hey guys, recently picked up an X5 again and love it. Adaptive drive is awesome. Long time BMW owner and I had an e53 a while back but this is my first e70. It's an '08 4.8 with about 115 on the clock. Got a few questions if anyone has feedback;

1. Transmission fluid. I know they say lifetime but if you've ever opened one you wouldn't believe it. Beyond just debating it, has anyone have recent experience changing it and for better or worse?

2. Engine idle. My sixers have always been silky smooth, like you can't tell they're even running kind of smooth. This V8 runs great and idles well but I can feel it idling. Is that typical?

3. Slight (suspension?) click/pop sound under footwell when turning. Car checked out fine and I threw it on the lift myself and inspected front suspension to no avail. I've since read a little about the possibility of loose subframe and/or transfer case bolts. Thoughts?

4. Can I stream pandora, etc. via BT? Can't Get it to happen.

5. One key doesn't operate doors or comfort access. Works in ignition though so I assume this means dead batt? Will it charge if left in ignition? Do I need to reinitialize?

I've searched around a bit on this stuff already, so any additional input appreciated.