It's now 1k miles after transfer case oil change and the noise has reduced considerably- it's barely audible. Have to turn off music and a/c and drive below 30mph to hear the transfer case noise.

One other thing I notice is that the front drive shaft turns slight clockwise or anticlockwise if I turn it by hand- is this normal? The rear does not turn at all by hand.

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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.