Gas additive for diesel engine

[Choupique]

Don't use additives in the fuel for your cummins. Buy good diesel fuel and be very diligent about fuel filter changes. Use OEM filters only (especially important with the front filter), change at the recommended intervals, keep the water out.

The vast majority of additives out there are snake oil. Highway ULSD has rigid lubricity specs and will work just fine for your engine till the truck rots to the ground around it.

Most importantly, drive it!

 

[tjfdesmo]

Your '21 has a CP3, no need to dose every tank. If I choose to dose a tank periodically as a feel-good maintenance gesture, I use Stanadyne.

 

[crash68]

Don't use additives in the fuel for your cummins. Buy good diesel fuel and be very diligent about fuel filter changes. Use OEM filters only (especially important with the front filter), change at the recommended intervals, keep the water out.

The vast majority of additives out there are snake oil. Highway ULSD has rigid lubricity specs and will work just fine for your engine till the truck rots to the ground around it.

The no additive might work for people where it doesn't get below 0°F. Some areas of the country get much dirtier fuel than others, there was a rash of trucks in the Pennsylvania area that was recommended to run fuel additives due to unusually high asphaltenes.
As for lubricity of ULSD is barely enough for the HPFP and sorta a joke compared to what's available overseas.