Cm2250 and CM2350 EGR Tune-up

[Hammerhead]

You have one thing working for you, and several working against you;
For you; you run heavy. That means high torque, which is high heat. That means the DPF is almost always in a hot state so when it does do regens, they're as efficient as they can be...
But against you; 1-stop and go, and short distances definately add to soot buildup as the engine is constantly varying RPM's as apposition to having a nice consistent RPM constant cylinder combustion.
2-Because you run short, the unit doesn't always have the opportunity to do the passive regens while running down the road. Your run timing suck, but that's your job
3-I do HH as well, and one of the biggest potential issues we face is idling the truck to build air (shitloads of it, I have 11 tanks on my trailer), build trailers, remove and replace the neck, etc. it's just a fact of the job. Limiting this is the biggest challenge, so use hi-speed idle 900-1200 rpm instead of dead idle. It creates more engine airflow, and it's the best we can do, doing what we do.

The biggest thing, INSTALL A BYPASS OIL FILTER IN THESE APLICATIONS, BEFORE YOU EVEN PUT THE TRUCK TO WORK!!! Soot problems and the subsequent wear will be that much exacerbated by the fact that you run a higher torque load average than 95% of other trucks, you need to be extra vigilant because of this. Oil change intervals at 200hrs MAX! If the oil seems heavily soot filled, consider dropping that to 150. I know that's short, but dude you lean on those components, protect them. I'd also highly recommend shimming your oil pump for the added protection of higher oil psi. This will also blast the oil harder at your Pistons through the cooling jets, potentially helping to prevent or prolong the soot packing issues.

It would mean voiding your warrantee, but I honestly believe that you would benefit from some custom tuning to make that engine run and burn cleaner if you don't want to, or can't remove the mandate due to your location.

Since you don't run many miles, I'd watch the hours instead. If your EGR system is not too bad after 6 months, you can try pushing it out to a year. Just keep a track/record of the hours at service interval and figure it out from there...a lot of this stuff is from trying things and sharing the info so we can all learn from each other.
Please share the data you gain, I would sure be interested in your findings.