Just did a complete transfusion. Engine oil/filter, t'mission fluid/filter, t'case fluid, front & rear diffs.
T'mission fluid was shot at 48K miles. T'case fluid was on the way out. Diffs could have been left alone.
Now running straight Amsoil Synthetic in everything.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i