Nice write up, very comprehensive!

I may have missed it but if you replace the reservoir, get a transmision thermostat, they like to break when pulling out the old reservoir.

I wish I got the same lifespan from my parts as you, at 50k most of the parts listed were dying and the rest of the system I replaced for good measure.

Only parts I have not replaced are water pump, pump pulley, and thermostat.

__________________
04 X5 3.0i auto
03 X5 4.6is