Diesel fuel additives??

Stanadyne

I add a little Stanadyne to my fuel at the recommendation of my diesel mechanic. Theoretically the fuel suppliers add additives to restore what lubricity was lost in the shift to ULSD a couple of years ago. I don't always added it but I do most of the time. I seem to get a little (0.5 - 1.0) boost in mpg but nothing scientific and probably nothing to off set the cost. Since my engine is from the LSD and not the ULSD age, I figure it can't hurt. If I had a new engine designed for ULSD I'd probably skip it.

Buy it at Rural King in 1/2 gal bottles for $22 and it will treat 250 gallons so it costs me around 11 cents per gal.

#2 diesel fuel needs no additive with possibly one exception. Diesel fuel comes in two versions- Summer and Winter blend. Winter blend is a lighter blend to prevent gelling. If you fill your tank with Summer blend then are going to park it until it gets very cold you "could" have gelling issues. In that case adding a anti-gel agent when filling the tank would possibly prevent a problem later on. Adding anti-gel agent to Summer blend in the tank that has gotten cold is probably too late. It needs to circulate and mix with the fuel.

Jim

I use the stuff in the grey bottle I get at wally world diesel kleen. Also ford sells an additive they recommend has recently dropped in price. Are they needed, depends on who you talk to. Cant tell if they make that much difference but if you use stuff in your car like techron why would a diesel be any different? Diesels need the lubrication these are supposed to give that the ulsd does not possess. For the oil there is a stuff called archoil that helps with the injectors which ford uses oil pressure to open/close. Rev-X is another but a bit more pricey. My BIL uses it and swears by it, I put rev-x in last oil change have not used archoil. I think the white bottle of DK is also a winter additive if needed I am not sure, as we dont get cold enough here in Az where I am at.

Hears a good blind study. You can read it for yourself who came out on top. It's an old study so who knows how good it is today.

Some of this stuff with emulsifiers or alky in it will kill a HPFP pump. Know what you're doing with this stuff or don't put anything in the tank because some of the stuff people put in their tank is worse than putting nothing in.

fuel additive we use in all of our diesels, and we put a quart of lucas oil with all of the oil changes. You really want to know whats best drive out to an old truck stop and see what they stock the most of.There is a reason the truckers use the stuff it makes your trucks last longer.Lucas oil

The only fuel additive ever needed is possibly one to keep the fuel from gelling in cold weather.

What are you trying to achieve?
I have been driving a diesel for a long time...towing and as daily driver and have never put a drop of additive in it.

I might consider a winter anti-gel IF I lived in a really cold climate.

(the additive vs non-additive discussion has raged on forever and will probably continue to do so).