Anyone with a Z3 should change the diff oil occasionally. BMW called it lifetime oil but it isn't. I changed mine in about 15 minutes and it came out like drinking chocolate. A lot smoother and quieter since the new oil went in.
Instructions
The diff has 2 plugs at the back. Remove the spare of you have one to see them more easily.
Loosen the top one slightly to make sure you can. You don't want to drain the diff and find you can't undo the fill plug.
Remove the lower plug and let the oil drain fully.
Put the bottom plug back in and remove the top plug.
With the car level, fill the diff until it just starts to dribble out.
Refit the top plug and drive away happy
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