So yesterday I stopped by a local store and left my car running while I ran in to get a couple things. Was inside for max of 5 minutes and when I came out there was quite a bit of white smoke coming out the exhaust. I have only noticed this at first start up a few times, mainly when it is cold outside. But this was enough to when I backed up it covered the car. Haven't noticed anything since then. Has this happened to anyone else? Should I be concerned? I let it idle for a while later in the evening and didn't see anything. Oh and before this I had been driving like a grandma (my mom was in the car) So it wasn't "hot" from running around.....