What are diesel fuel additives and how they work?

the # of additives for diesel fuel are many. most do not work. Lucus is the better of them all. but if you are really concerned about your fuel condition the only way to be ured that only good clean fuel gets to your injectors is to invest in a good quality fuel/water seperator. they can be a bit costly but the alternative of injector and or engine damage is much more. if you live in cold climate some are equipped with a heating element. Rocor is the best in the biz