I just went downstairs and didn't see any more leaking, but I did open the expansion tank and the coolant level is below the MIN marker, and the float is all the way down as far as it can go. I do see some coolant in there, but it's not filled by any means.

Anyway, I am waiting on a tow truck driver to come pick the X5 up, since I don't feel like risking it and being on the side of the highway, without a motor to heat the cabin, in 25 degree weather.

I do, however, see where the leak was, and how it leaked down the components inside the engine bay and to the floor, so there is solid evidence that it was coolant that did leak out. I was considering perhaps it may have been the front strut, but I didn't see any leaking from that.

Anyway, I guess the cooling system is covered by CPO, according to bmwusa.com. Also, the tow is free. Not sure if this is because I subscribe to BMW Assist or because it's just included with any BMW warranty. Regardless, it seems overkill to get towed, and if it was summertime, I'd agree. However, being stranded for a couple of hours on the side of the highway in cold weather isn't my idea of fun.

Also, yeah, the earliest tow truck is at least two hours out, the other companies were at least five hours out. So, looks like I'm working from home today.