New 5.3l and 6.2l are direct injection. They tend to get carbon build up more than other fuel injection types especially at idle conditions where most HD trucks tend to be when waiting on the job site.
Read the same problem with the a fleet owner of F150 Ecoboost trucks, which is direct injection as well. They were getting carbon buildup under 100,000 miles, which also can lead to turbo failure when it breaks loose.
Ford's 6.2L is used on both F150, F250, and F350s. Time to change to a Ford and reap the benefits. :)
