Yesterday, I replaced the mechatronic seal, filter, gasket and partial oil.
I've done the filter, gasket and oil before, so not much in that.

This is the first time I've done the mechatronic seal though.
Last oil change it was fine, but recently developed a leak when left for a week.
I knew it was a good preventative thing to change, but believed it was quite tricky to do, so didn't do it last oil change.
Now that it is done, I was surprised how easy it was to change!
If you open the gearbox, I would definitely recommend changing the seal, even it it's not leaking yet. It's just too easy to do, since you're in there anyway.

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2004 E53 X5 3.0d