I have a 2004 F250 with a 6.0 powerstroke engine. It often has what many refer to as turbo bark or turbo cough. Other than that, the truck runs good and gets around 21-23 mpg on the hiway with plenty of power. Some say this is fairly common in diesel engines. Personally, I have no idea and would like to hear what some of you diesel orientated guys have to say about it. The truck has only 57,000 miles on it.