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I just mix up some garden Sulphur in a quart of diesel and add it to my tanks.Blackness is usually what they call asphaltene contamination.
Brown snotty are usually algae contamination.
Both conditions take a different treatment to combat the effects.
I'm sure Larry can elaborate.
With the Sulphur being gone as a lubricant you could use a lubricate additive as long as you don't have an SCR/DEF afterteatment system.