Not the recommended OCI from the factory. These are utility fleet vehicles, and we go by oil analysis, not factory spec's to set a base line for different vehicle types and applications. We have some 1500 gas engine trucks on 15,000 OCI. On our 9 liter engines we change at 500 hrs.Just some information I thought might be useful in the filter / oil debates. Personally I use Delo 15-40 and wix/ napa filters, change at 10,000 OCI, and have good oil analysis with my 2012 6.7 liter, but being full deletes I don't have as much soot to worry about. A lot depends on the use of the vehicle and the operator. With vehicle condition we may adjust the OCI as needed. With a 100 vehicle fleet at our shop it is the only way to work the maintenance.
Before I deleted, I was getting less than 5,000 miles before the oil change light came on, first change after deletes the light came on around 7800, at that point it was still black, but to the eye it didn't seem as dark, or sooty as before. I assume this was from residual soot in the engine. I did an oil analysis and bumped to 10,000, it is still very dark, but delo is a dark colored oil to start with, and I am going double what I did before deletes, I am about to change the third time after the deletes and am going to the 2018 RAM spec's of 15,000 OCI. We will see what happens.
Factory OCI on the 2012 is 7500 miles, if you can get that far. Fuel dilution always caused my change oil light to come on much earlier. That shouldn't be a problem with the DEF trucks 2013 on up. Oil analysis on a couple of changes to set a base line, then extended drain intervals after that with a follow up analysis every third, or forth oil change. It's not that I can't afford the oil, but I don't like wasting 12 quarts of good oil either. If your worried about the filter lasting that long, spin a new one on mid way thru the change, very little oil in the filter, shouldn't even have to add any at the change. Just my 2 cents and what works for me, everybody needs to do what they are comfortable with, and what they think is right for their truck and pocketbook. Thanks for listening..
https://www.overdriveonline.com/the-bypass-filter-advantage/Bypass filters will remove soot. Amsoil, Frantz and other brands will handle soot. Even if you let it get to the point of plugged, it will not hurt your engine in any way. The best thing you can do for your Cummins is add a bypass filter system.
I currently have 262,000 miles on my 2004. It has never been in for any kind of engine work. I do my own service work. Which includes a Frantz Filter. My Blackstone reports have been to keep doing what your are doing. I mainly change filters and add oil to make up what was in the filter. Last oil change was 60,000 miles ago. My oil looks great and is clean. Using Valvoline 15-40.
Clean Oil is more important than the brand.
It takes into consideration short trips along with long trips. I never have my oil change reminder come on until 15k no matter the time. Same for my 11 HO as it was 7,500 miles.
A little proof of your assertion about trip length is in order.