I don't use any additives in my diesel and never have. I don't care what you add in the fuel, if you get water in it, algae is likely to form. If you try to put water thru an injector, you are going to damage it. The only additive I would say is really needed is anti-gel and then only if you are in an area that gets below 20F and stays there all winter.
I ran an old 1984 Yanmar on straight diesel with no additives ever and never had any issues with fuel, injectors etc. My current tractors are designed to run on ULSD. Most of the stuff on the shelves for cleaning injection systems, increasing oil lubricity is just snake oil much of which has carried over from early 60-70-80's when MAYBE some of the stuff was needed for cleaning the injectors in the new systems and gasoline wasn't filtered enough to keep from dirtying up the fuel systems. Now days, I don't think any of that is needed. I don't use it in any of my vehicles and never had any problems with O2 sensors, injectors fouling etc. Cleaning the fuel rails is big money to a mechanic that uses a $10 can of cleaner and charges $100 or more to do it and does absolutely not one iota of good.
I buy my fuel from a distributor who delivers to my house. It is clean fuel, I keep it stored inside my enclosed shed so no rain can get to it, temperature fluctuation is less also so less likely to get condensation, tank has no vents so is not open to atmosphere either. I have a good fuel filter on the pump to remove any thing that may be in the tank. So far, I have never had to change any fuel filters on my equipment and the ones that have a clear housing show not a bit of contaminates so why change something that isn't dirty.
I would say if it makes you feel better to put an additional $15 per hundred gallons into the tank, then by all means do so. Peace of mind is worth that for sure.
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