I just moved into a home with a 3 car garage. I'd like to get a hold of something like that as well so I can start doing my own maintenance.
Here's the thread for owner's manual to start:
http://www.z4-forum.com/forum/viewtopic.php?f=2&t=24559
An item I found on eBay:
http://www.ebay.com/itm/BMW-ETK-EPC-...cde5a4&vxp=mtr