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Pretty sure there is a thread topic on maintenance here. If not check the F30 section.
As for the tranny fluid, I noticed that my local BMW dealership sells fluid and filter kits for our ZF8 despite the whole "lifetime fluid". Interestingly the service dept. refuses to perform the change unless there's something wrong with the tranny.
My car is at about 77k km and I've done all fluid changes except tranny. Will tackle that at 100k km. Or sooner. So far the only tricky one I've experienced is the xfer case fluid. There is a thread about it that I have appended my thoughts and tips.
Modern BMWs come with AGM batteries. They are more advanced than the regular lead ones and are able to cope with the electronic stress associated with modern European cars. That said one of the SA I spoke with told me that weak battery can lead to faulty/false alarm sensor codes. It is a good idea to keep a batter tender and charge the AGM battery every so often to keep it healthy.
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