Well, I finally brought my car in to check on this issue. My car has lost the amount of coolant represented by the full and low marks (confirmed when cold or hot) In a Span pf about 400i. They ran a pressure test and also shows me a full visual inspection including having the car on the lift and taking th undercover off. Sigh. At lest they did it all with good faith diligence. Guess they will too it off and I'm glad it's in the system for now in case this gets worse as time goes on.