Yep. It's the turbo.
The" rolling-coal" tools are just a bunch of dummies that think black clouds of inefficiency look cool. It is cool to stop at the gas station daily after-all. They coke up their turbos & cook the bearings in short order from carbon accumulation. So the situation usually sorts it self out.
Real high performance diesel is as clean and invisible as car exhaust. Back when I owned a 400hp, 600ft/lb torque F250, it would get 18mpg and never blew black smoke.
Last edited by base2; 04-01-19 at 11:45 AM.