diesel guys

The ULSD has been in Europe for years before it came here, since your Duramin is an Isuzu engine I'd think that would have been worked out years ago. For the record the last generation of 24V Cummins 5.9's had some injector issues too but it was traced to not having the proper plating on the pintle. All the 2 stroke and motor oil in the world isn't going to fix that.