It's been a while since I looked at it but ULSD has been a problem for injection pumps and was a frequent topic on Cummins forums for a time. Discussions have slowed down possibly because the vehicles are older and there are fewer of them with most of the problems documented. I run 1 oz of 2-stroke/gallon of fuel in the Cummins and have 100,000 mi on the injection pump without problems. 2-stroke is easier to find than Stanadyne and less concentrated so easier to avoid over dosing.

Lubricity Additive Study Results - Diesel Place : Chevrolet and GMC Diesel Truck Forums

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.