........What happens when you run biodiesel, or is that just a personal preference for you? Here in IL, you'd be hard pressed to find non-bio diesel. And there are Sprinter fleet vans running everywhere......
ULSD not > 5% bio. BAD EXPENSIVE DAMAGE TO EVERYTHING in injection system, fuel tank, exhaust, intake, and oiled bits in engine if you regularly exceed that. That said. Its likely OK from time to time as you need to. Example: Love's ULSD is labeled > 5%. A tank of that followed by Regular ULSD would likely be OK.