My c15 rebuild

[Running rough]

I do believe even cat engine recommend the c15 Acert to run 1500 to 1600 rpm when pulling 140000 lbs or more, I can't see where a moter will last if a guy is trying to pull super bs at 1200 rpm up a mountain all day everyday, unless of coarse the engine was specifically designed to do so like the Volvo d16xe, I can see extreme lugging damaging Piston skirts and vibrating liners, not say that's what happened with Brock's moter but I have seen c15 acerts with simuler symptoms where the skirts on the pistons are heavily scratched and burning oil like its goin out of style mind u it was a higher milage engine