I have not witnessed this yet, but my wife claims that my 2003 WRX smokes profusely on start up and for 3-5 miles afterward. I cannot recreate this. The car runs and drives perfectly for me. She says this has happened twice. Once on Thursday, and again today. So far, I have not found any oil in the overflow, or anything leaking. I am thinking it is probably a turbo seal. What do you guys think?