One seventy mile trip to MB dealer to get a second AMG license tag and in slow city traffic, the low coolant light comes on with normal temp indication. Could mean trouble. I topped off the water and drove another 60 miles home with no troubles. We will be doing the second oil change on it tomorrow. Perhaps we didn't fill it all the way when we flushed the coolant system. I hope that's all or else I feel I will soon be looking for a head gasket.