FYI, I found this document dated Jan 2015. Mexico recognizes the importance of establishing availability of this diesel fuel and exhaust fluid ahead of the proposed January 1, 2018 implementation...
Other than dyed fuel diesel of all types can be different colors. I have had almost clear ULSD and amber. May have to do with the presence of Biofuel. Some states and provinces have laws that there must be some biodiesel. What a joke!