I think I posted this in another thread on ULSD a while ago along with spec's. I worked for a transit company that was one of, if not the first, in the USA to run ULSD (only one refinery was setup for production when we started). First thing that happened is we plugged about 33,000 (+/- a few) fuel filters in about 5 months. Then we had a rash of injector failures. Mostly they were Cummins Celect and Celect + injectors, some 6V92 DDECII as well. Although injector life has improved some, it is still not back to pre ULSD reliability. The official answer from Cummins is that we are changing the injectors too soon. At the time most injectors were being changed around the same time the units were due for a tune-up. The Cummins said the difference in run-ability was due to the tune-up. I don’t buy it for one minuet. I never saw one we tuned up that was very far out of spec, certainly not enough to create the problems seen. I also find it hard to believe that these failures occurred in close proximity to the switch to ULSD. The only fuel systems that are living as long, if not longer, than “normal” lives are the units that are being run on B5.
On my personally vehicles, I run B20 or B99 (depending on which is less at the time, both are less than Dino Diesel around here usually) when I’m in town. When I’m on the road I just fill at any truck stop and add Stanadyne Lubricity Formula. I will not run any of the current pumps fuel without some Lube adds. PowerStroke injectors are about 250-350 a piece times 8, Cummins fuel pumps (Bosch) are anywhere from 450-2500+ depending on model and specs, it’s not worth taking the chance of trashing one for the cost of a lube add, IMO. I think it is even more important with rotary and common rail type pumps, or any that have many precision moving parts that depend on fuel for lube.