You should not see any extreme changes after using ULSD, though your rubber fuel lines may weep because of the absence of sulfur, the same thing happens when you switch to high blends of biodiesel. ULSD actually has higher cetane than the old fuels contrary to what the last post stated, you might get better fuel mileage depending on the energy content, and it will burn cleaner and more completely.
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The main problem i see is lubrication. Which is wat ULSD lacks, if i were you id pour in half a gallon of veggie oil or biodiesel to suppliment as the lubrication.
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You don't need to add any additives either. Additives have already been added to the ULSD to help with lubricity, which shouldn't be a problem in the first place since our IPs are lubed with engine oil. Theoretically, you could run on fuel with no sulfur, and our engines would be fine.