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ULSD has less lubricity beacause the process used to remove the sulfur also strips the fuel of it's natural parrafins.It is these parrafins that are responsible for the added lubricity of normal diesel, now they have to add lubricity agents to it. my truck does not like ULSD, and i know in 07 here in florida where i am i could not find LSD, just ULSD. Now when i went on a road trip, and filled up with LSD in GA, my truck ran a ton better, much quieter. I run DK every tank, but it's still not like running LSD, which sucks........
 
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