from what i read on this and other sites it seems cummins is getting a bad reputation of being unreliable due to the 6. 7. this is sad and it is sad that cummins and dodge put out an emmision compliant engine that clearly has bugs to work out and they are being worked out on the customers time and money. i love my 04. 5 cummins but i can say with out a doubt that i will not buy another dodge/cummins till the milage goes up and the emmisions managment problems are addressed and fixed. .