Sorry, I read some stuff that made the Redline SI-1 appear to also work for diesels. I still wouldn't put anything with alcohol in it in my fuel system.
It looks like Techron D is an additive made for diesels and contains PEA. There are several with PEA in this article:
http://www.dpfproblems.net/effective-pea-diesel-additives-which-work/
I used to use Techron D a fair amount. After some problem engines not getting especially better, I found had more luck with SeaFoam, but I really think it depends on what your particular engine is dealing with. PEA (PolyEther Amine, not what the author above claims in the link above), is a fine detergent, but there is so much fluff and unsubstantiated material around fuel additives, that I would take anything not supported by quality third party studies to be magic at some level.
The optilube recommendation came to me from a third party study quoted over at
www.dieselplace.com
I would point out that while biodiesel had the greatest increase in lubricity in the above study, Lister Petter specifically recommends against using biodiesel and vegetable oil in generator applications. In regular engine use, Lister Petter allows it, but recommends replacing all of the fuel facing rubber materials with fluoroelastomer versions (aka Viton o-rings and tubing). Biodiesel and vegetable oils are more prone to oxidation (turning into acids that corrode metals), and being consumed by bacteria and fungi, aka diesel slime/"algae", which will really shorten the life of your filters and injectors.
I agree with
@DieselAddict that there is nothing like actually disassembling things and cleaning them, but for mild cases a slug of your favorite fuel cleaner additive can go a long way.
All the best,
2Pbfeet
youtube.com
