All four of mine were replaced. Definitely replace #7 while there. New plugs for fill and drain are cheap too. Use a squeezable oil bag to refill it. Or run a fill hose up through the engine to the diff. Most new CV shafts should have a new nut. Mine were corroded enough we used a 7 ton puller.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)