Richard the best way to tell the differance betweem LSD and ULSD is to taste them, the ULSD is sour
I am wondering if there is a value to finding a good aftermarket additive to boost the lubricity of the newer ULSD. I worry because I have found out through the CAT garages that the C7's injectors are a very sensitive piece of equipment. Most importent "clean fuel filters" and "Clean Motor Oil"
Good work Jerry, that should quell this debate