I have been meaning to write on this topic. I too had this happen every once in a while (wasnt really blue in color but that was looking out of my rearview mirror so not 100% sure). I may have found the trick to it though...at least for my car. \
When I pull in the garage, I let the car idle for about 30 -45 seconds to just calm it down so to speak. I typically drive the car fairly hard when I take it out...so I figured why not let it relax a little before shutting her off. When it was happening every so often, it would be after a drive where I was going pretty hard, pulled in the garage and just shut it down...
Since I have been doing this - over the past couple months, I have not had any smoke at all on start up.
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