I have had no problems with my 03 6.0. It has 20,000 on it. It is the most impressive truck I have ever drove. Two storys: My bud just sold his chipped 97 that he loved (300,000) and bought an 05 psd...He is very impressed and has no plans to run a chip. My other bud recently took order of an 05 duramax, he was in my rig the other day and is now feeling pretty bad that he swiched from Ford to chevy. I dont know how they will do in the long run but they are very impressive to drive. It seems the bugs have been worked of the new and first build models(mine never had any). Who nows, maybe in 10 years we will look back and say they where the best engine ever.