I Purchased a 2014 Challenger R/T 5.7 Hemi. It only has 385 miles on it. After sitting for a few days it blows blue smoke out of the exhaust on start up. It last about 10 to 15 seconds. I also noticed a build up of black carbon deposits on the rear Quarter panels of the car. I took it to the dealer and they said its part of the break-in. That's bull. Has anyone heard or have had a similar experience?