No oil wear adaptation required on the non-Xdrive NV125 transfer case. Fluid type is ATF (Dex III, a little less than 1l I think). Diffs both use gear oil - Redline 75w90 is what I’ve used. Front diff is 0.7l and rear is 1.5l, so you need three 1l bottles for this job.

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)