Quote:

I've heard that DEF has a shelf life. When putting in storage or between trips should I fill it up or leave it alone?

wolfe10 wrote:

If storing diesel for over 2 months in summer or 3 months in winter, add a BIOCIDE such as Biobar JF.

Then fill the tank to minimize condensation.

Run engine and generator long enough to get them fully up to temp (like 25 highway miles) and park it.

If in very cold climates and you filled in the summer/fall, add an anti-gel. Walmart carries PS brand.

two travelers wrote:

We recently purchased a 2023 Winnebago View. New to the whole diesel fuel issue and have a few questions.

1) Do I need to put any fuel stabilizers in the tank when in storage or between trips?
2) A friend suggested using Bio Bro to keep fungus down. Do I need to use it?
3) I've heard that DEF has a shelf life. When putting in storage or between trips should I fill it up or leave it alone?

valhalla360 wrote:



Condensation has been shown to be a myth. If you change the air space over 100% each day as the temp falls then rises and you squeeze every molecule of water over 100% humidity air...a 50gal tank might generate the equivalent of 3-4 peas volume of water. In reality, you won't be at 100% humidity and you won't squeeze every last molecule out.

Doubly so, with modern vehicular fuel systems which aren't open to the outside air.

Anti-gel only matters if you will be using it during the winter. If you are putting her away for the winter with no intention of using her until spring, the fuel will gel as it gets cold, then it will un-gel when it warms up.

klutchdust wrote:

I use opti- lube XPD additive to my fuel every fill up. My engine does not require DEF. It's an 06Duramax with 100K miles. The cost to replace the injectors on my engine is 3K. The additive, in my opinion holds that off a bit longer.