My 550 has 18 hrs. on it and blue smoke comes out the exhaust when I de-accelerate. I have carried it to the dealer once at 8 hrs. and was they adjusted the fuel mixture. Said it was running too lean. Still doing the same thing again. The smoking stops once the rpm's increase to a higher number but once you slow down and then speed up more blue smoke. Anyone else having this problem? Mine is a 2012 550 one seater.