Some may believe additives are snake oil....not all of them are.
All diesel engines
NEED to have an additive if they are running ULSD! With a little over a year of use around here is showing it's effects.
ULSD is more hydroscopic and attracts water...you need a water dispersant. Cetane is a little lower too...cetane booster. We already know about lubricity, the stripping of sulfur also strips the lubricity out. For lube I like biodiesel. Most don't know but sulfur is a natural biocide...now with it gone you need a biocide.
I recommend Stanadyne Performance formula....made by and injection manufacturer...and Racor biocide.
BTW....for those that don't know....I see the internals of pumps and injectors daily.