My 2015 Camry (2.5L 4Cyl 178 Hp) has used one quart of Mobil 1 0W-20 oil in the first 4,178 miles. I'm shocked. The salesman is surprised both at the oil usage and that anyone checks the oil anymore. I've spoken with the service department (the service manager told me I talk too much) who wants to meet with me next Tuesday to write the problem up for the Toyota engineers. My brother says this usage is fine, quit worrying, nothing will happen, the engine will last forever. Is he right? Am I overreacting? My son says this will foul the spark plugs, lower the full economy, and mess up the sensors. Is he right? I need advice? How should I handle the service meeting. Thank you so much for your help.