I've seen a few of them break exhaust studs.
And had a buddy from another shop that was quite skilled at changing broken exhaust studs in super duties.
Now I'm not gonna say it's a pattern, but it just might mean something.
Mileage sucks and power is uninspiring, atleast laden, our service truck managed 3-4mpg highway best I ever saw was nine, weighing in around 16k. Previous diesel felt like it had four times the power and got about four times the mileage, not that 12mpg is fantastic but compared to 4 it is, weights varied but they were within 2k of each other most the time. And if you run them at their max all the time the fuel pumps die about once a year, however it doesn't strand you like pumps of old, it just can't deliver the volume and pressure to make power, you'll notice it pulling hills and things.
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