I have a 2012 Mustang GT/6 speed automatic with 39K miles that will send a little blue smoke out of the exhaust for a few seconds under hard acceleration, something that I don't do often. There are no trouble codes and nothing indicating a problem when my mechanic runs a live scan. There are no leaks or seepage that my mechanic can find and I'm not losing a noticeable amount of oil on my weekly check. My research leads me to believe that the valve stem seals need replacing. My mechanic seems to agree but does not think that it's something that constitutes an emergency but should be done in the near future. I'd like your take on the matter. I've been watching your videos for quite a while now and your opinion holds a lot of weight. Thanks in advance.