This passed friday I did another oil change, as it had been 8k miles already. I also drained and filled the front diff. I've done 2 or 3 hundred miles since, and the diff noise hasnt changed. I have everything to do the rear diff fluid, so I'm planning on doing that on wednesday I believe. Curious if the diff whine goes away. Sprig time I do plan on swapping diffs regardless.

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'10 X5 35d- 279k mi, deleted and DUDMD stage 2, daily and tow vehicle
'01 330i- Drift car: SLR Super angle, BC coils- keep it simple
'07 335i 6mt - Sold @ 171k miles- stage 2 daily commuter for 2 years