2016 2.5 limited with 57k miles. Just had service done at 55k. This morning got a puff of grey smoke out the exhaust. Not condensation smoke. Smells like exhaust. Goes away immediately. This is probably the 4 time this has happened this year. 2nd time in a little over a month. Car acts fine, still gets around 540 miles per tank. No hesitation. First thought overfill of oil. Checked it and it’s just below top circle. Coolant was way above the full line. For some reason subaru decided to refill coolant a lot. I removed some today back down to just below full line when cold. It only seems to do it after car has sat and is a cold start. Never does it when it’s been driven all day. No smoke while driving. Have not noticed and oil consumption. Check oil regularly with no loss. I’m stumped. Any ideas why I get this puff of smoke every once in a while.