No, I just know that GM has had some issues with the emissions equipment. But, so has Ford and Dodge. Its the main thing that is hurting the diesel industry right know. They are going through what the muscle cars went through back in the mid 70's with all the smog stuff. I have both cummins and duramax trucks and they both are great trucks. I like the Ford trucks but personally don't like any power strokes after the 7.3's. Dodge used to have a lot of transmission problems but now they have the 68rfe and a Aisin which are better than the old trannys. I still believe Ford has the best tranny though. Cummins and Duramax trucks I feel are a good all around package. I think Ford has awsome trucks ,but I'm just not comfortable with the power stroke. I also think they are harder to work on. But thats just a matter of opinion and preference.