2003 3.0i approaching 50K miles, what service?
 

I'm still debating on touching the tranny fuild. Some say do it, some say dont fix what's not broken...

Im thinking:
Transaxle fuild
Diff's fuild
Power steering (again via turkey baster method)
fuel filter
air filter

Anything else?

I have been doing oil changes with BMW oil and filters every 5K miles since I purchased her at 37K miles. I also add a bottle of techron to the fuel at each oil change.

I'll add brake fluid flush & fill...
GL, mD

You don't have a transaxle, but I assume you mean the transfer case. Not a bad idea to do it, it is straightforward with a pre x-drive X5.

Have you done the coolant yet?