FUEL ADDITIVE & TREATMENT Filters Sort results Reset Apply IDProduct Name 4426 Flow Max WF-ExtremeTotal Diesel Fuel Conditioner. 4422 Ultra Multi FunctionTotal diesel fuel conditioner with the most cetane boose and additives available. 4421 Diesel Fuel Winter TreatmentWinter total treatment. 421 Diesel AdditiveComplete fuel oil treatment 1:1000 --- Fuel Oil AdditiveRemoves Soot Sludge etc. 185 Dry GasCleans Engines & Prevents Gas Line Freeze.