Mine is a 2006 X5 3.0i 6spMT with 134K miles...

The last time I checked my flex discs (front and rear DS), they looked like 95% perfect with only very very minor surface cracks. I had to look very closely to see them.

However, I plan to overhaul the driveshafts between 135K-150K:
- New flex discs x 2
- New CSB (BMW brand)
- Regrease the Rear CV Joint and replace the paper gasket.

__________________
1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT