So I wonder what lubricates that bearing? Does it rely on some diff oil to be put into the housing? I imagine the seal on the diff side of the oil pan seals the diff oil from the tube? The o-rings seal the housings to the pan?

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)