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BMW coolant. So far I'm only seeing flecks appear around the expansion tank (near the top rim). Again, tank isn't that old, and nor is the cap.

School has got me busy but when I get time I'd like...

Thanks for all the great suggestions. I am doing my best to find it, as at this point it now leaks fast enough that if I drive it briskly enough it will lose the coolant in the first 20 mins of...

Sounds like the pump is a good place to start. The coolant sensor and o ring is actually also fairly new forgot to mention.

Rats. Is there some sort of safe dye I could put in the coolant to try and make the leak more apparent? Gently pump air in and listen for hissing?

The water pump has never been replaced. I...

I know this has been asked about a thousand times--I have a coolant leak, and I can't figure out where it's coming from. I'm trying to figure out if there's a place that poses a higher failure rate...