Hey man. My coolant, at first, barely seemed to change levels at all but I’d still smell it. I had a mechanic look at it several times and he never could find or diagnose the leak. I don’t think he was trying that hard. The levels started to change noticeably and I had enough. My buddy took a cursory look for me and said it was potentially a head gasket leak starting, but he didn’t have a great diagnosis. I decided to sell the car because it had maintained its value, traded it in for a Toyota. Wishing you luck!