Do not worry for white smoke, its the blue that is the enemy. That blue is the color of oil smoke. When i start my car on cool mornings i steam up my rear window till the exhaust temp gets up.I get white smoke out of my exhaust every once in awhile. Doesn't happen every day. I noticed it after I got a test pipe. Kinda sucks because I don't feel like taking my car to the dealership to get another turbo. Seems like a pita. Kinda disappointing that this is happening because I really take care of my car. I always let it warm up, cool down, and change my oil all the time. Kinda makes me wanna just get a v8 car