Just did a lot of work on my 2003 6 L...studs, planned heads,EGR delete,oil cooler, injectors, spent more than the truck was worth. 2 injectors have since failed and have been replaced. Some say the truck is bullet proof now. I'm wondering if others have done this and what was the outcome. This truck was well looked after by the previous owner so was very disappointing to me to have this trouble. But like the diprocol guage ad says " There are 2 kinds of 6 L owners, those who have had problems, and those who will have problems." Have I had my problems?