2000 BMW 328 6 cyl 90000 miles
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I recently bought a 2000 328i and it came with NO owners manual. I had it tuned up and checked out and a day out of the shop a light came on that looks like a car battery half filled with water but I'm not sure what the icon means...it comes on about 10 minutes into any drive I take. Any ideas?

This seems like the low coolant warning. Check your coolant level. You did not state what color the light is, if it is red this may be a alternator warning, if yellow then the coolant warning is probably what it is.