I just purchased a 2011 heavy duty 2500 diesel. I just am really excited and very happy. Until I talked to a friend. He stated another acquaintance talked to a diesel mechanic who made the statement to not buy a 2011 or 2012 because there were problems of the pistons burning up due to inferior parts from diferent suppliers. He said cummins was getting parts from different places and the parts were not holding up. Is this just talk or is there something to it? Please give me some input thanks.