Heard a rattle on start up @ 56K. Local dealer replaced VVT and chain no charge under warranty, no questions asked, car was at dealer one night. They changed oil and suggested another oil change in 1000 miles. I believe they must have also done a reflash, even my wife says car is much stronger off the line. Very pleased with results, I did have the shutter valve done at this dealer, but have always done my own oil changes. MartyD