i.m.o. the number one thing you could buy right now, used would be a Bentley manual for your make/year. others may suggest another but Bentley has done a good job for many on the forum. For $65 or so (used) you can't go wrong. For about $110 or so new, you can't go wrong either. One of the things that it will tell you that is important to you now is that you can ONLY use BMW coolant and it needs to be mixed 50/50 with distilled water. So head to the dealer and pick up a few gallons or, better yet, hit up one of the sponsors of this site and order from them. If you weren't aware of that it may have saved you the cost of the book right there. And if you, unfortunately, used some other coolant you may want to think about flushing as soon as you can.

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'14 X1 7000 miles

Hasta luego a

'10 X3 3.0 55k miles
'09 335i 55k miles
'08 528i 94k miles
'09 Mini 88k miles
'06 X5 3.0 112k miles
'04 X5 3.0 128k miles
'99 528i 120k miles