[Desert185]

My concern is for my older, 24V Cummins. The injection pump was designed before ultra low sulfer diesel was mandated by the feds. The lubricity of the ULSD was reduced, as a result, so I add Diesel Kleen according to the ratio recommended on the jug to compensate. Diesel Kleen also cleans the fuel system and increases fuel cetane (Google it). Walmart seems to have the best price, BTW.

While not really a snake oil guy, there are additives (snake oils) in gas, diesel and oils for our rigs and other things in life. I plan to keep my truck for awhile, so scheduled maintenance and proper injection pump lubricity is important to me. If you regularly trade in your vehicles, you probably won't see the benefit of the diesel additives.

I also carry a spare fuel filter in the truck (and have never needed it), but others have with a bad refuel of diesel. I just don't want to be stuck in "east dying cactus" on a weekend without a spare.