Called dealer and he gave me the procedure to top it off. Which I also read in the owners manual. Took 3 cups of distilled water. He said that is pretty typical in these cars with a big drop in ambient temperature which we've had. Here's after the fill up. Car goes in for annual service (3 months early) in the next week or so. Hate the annoying light already reminding me 90 days out. Anyone else have to top off their coolant?