I believe that sulfur served the same purpose as lead in gasoline, it provided lubrication.
Most fuel meets a min of 0. 05 ppm sulfur content.
You can use stanadyne PF, Amalgamated #15 diesel additive (best one around), Howes Meaner Power Cleaner ( leans more to lubricity than cetane improvment), LE (lubrication engineers ??).
Since our injection pumps are cooled and lubricated solely by fuel it pays to have a bit of additive in the fuel system. At least once every two tanks anyway...
Just my opinion...
Bob.