In the manual or service manual it says to change the diff fluid every 3rd oil change. I had to fight with my dealer to cover it under the maintenance warranty just before it expired.
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12 M3 Interlagos Blue/Black
18 Jeep Grand Cherokee (Yeah, it's got a HEMI)
21 X3 Silver/Black(Wife's)
06 330i Monaco Blue/Black (retired)
02 X5 3.0 Topaz Blue/Black (retired)
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