with how shitty fuel quality is around here you definitely need to run some kind of cetane additive, i’ve been running motorcraft cetane boost and i believe stanadyne most likely makes it for motorcraft only in a less concentrated formula. it smells the same thats for sure.
any time you have an egr cooled engine you’re putting a lot of exhaust into the intake. the less carbon the exhaust the less chance you have for sticking turbo vanes or egr valves. cetane increases burn temp for more complete combustion. we all know heat is everything for diesel engines and cetane boost has always been highly recommended among ford technicians
also ulsd is very dry as far as diesel fuel goes. any kind of additive should have better lubricating properities