The tech at my local dealer can't possibly know from experience how low it is quart-wise from the dipstick. I'm the only one in town with one of these cars. They don't know one single thing about fb engines or the 2012 impreza. At all. They told me "those are 500,000 mile engines" to which I made a very sarcastic remark about how much oil it would be consuming by then. I still think its a sensor thing but am getting the oil consumption analysis set up this saturday.