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Do ULSD and LSD fuels differ in appearance?

April 26, 2017Appearance differ fuels LSD ULSD

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Do ULSD and LSD fuels differ in appearance?

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A. The refining process that removes the sulfur can cause ULSD fuel to generally look lighter in color and possibly have a colored tint. ULSD fuel may have less odor than other diesel fuels due to the reduced sulfur content. Changes in color and smell do not impact the performance of ULSD fuel. ULSD and LSD fuels for non-taxable use may be dyed red, similar to today’s non-road diesel fuel. These possible changes in appearance also might be noticed in LSD fuel, as downgraded ULSD fuel can be sold as LSD fuel.