Picking up my first Duramax, whats the recommended DEF brands? & Additives?

[KinkyDuramax]

Hi all!

 

I have two Sierras in my fleet both are 2.7. I'm trading up from the 2020 Elevation to 2023 (refreshed) Sierra Denali w/ the Duramax motor. I love the way the 10spd feels and the way the motor performs in a half hour drive. Also experienced what regen is, so that was good to see. Now, as for DEF fluid - Is there a specific brand to go with? I shouldn't be towing as often but I do know if I do, it'll require some DEF. 

 

Is there a specific brand to use? I do have a truck stop by me that I pass twice a week, that does have DEF at the pump available. Additionally someone has recommended me to use additives in the diesel tank every so often to prevent soot or something in the engine. I did read the manual and noticed they have a recommended product for it, but was curious if there is one better than the other Etc. 

 

Thanks in advance!

[Jay P]

DEF at the pump at a truck stop is usually the freshest (usually cheaper also). Heat and sunlight degrade DEF so don't buy the store stuff if it's sitting in the sun. Brand doesn't make much difference. Learn how to read the date code so you are getting fresh DEF.

As for fuel additives, I don't use them unless there is a good reason (like antigel in the winter). Best is to just get good diesel from a station that has high turnover. Some swear by additives and some think they are snake oil, mostly a personal preference.

[HondaHawkGT]

A lot of guys I know use the Archoil fuel additive but it might be totally unnecessary for this engine. The big thing is changing the oil often with the correct oil. Don't do what some youtube guys have done and use regular Dexos 0w20. Use good fresh DEF and don't let the truck idle for long periods of time. Like mentioned, stick with fuel stations that have high turnover of their fuel.