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Mayor30's avatar
Mayor30
Explorer
Sep 16, 2023

DEF fluid

Is all DEF fluid the same? I usually buy the Blue DEF but it's now about $20. Our local hardware store has the Blue DEF and another one that is $12.99. I did buy the Blue DEF but just wondered if the cheaper one would be ok.
  • Some stores offer a premium DEF - Platinum I think... You don't need that. Just buy the regular Blue DEF. Last time I had to look around for the cheaper stuff.
  • Michelle.S wrote:
    Or buy the Walmart Brand for $9 to $12 for 2 1/2 Gal. Been using it since 2005 in three different trucks and no issues.


    2005? Mmmmkay
  • Very simple formula. No perceived difference between suppliers of DEF.
  • DEF is DEF. I don't spend more for the Blue. I either get it from Walmart, or from the pumps at a truck stop (I like Maverick).

    If you buy it at Walmart (or anywhere) I'd look for the expiration label. From what I have read, expired DEF won't hurt your engine, but you will use more.
  • DEF is regulated to be a specific formulation so they are basically all the same.

    Recently Costco had blue def for $12 for 2.5 gallons. I just buy from places that likely have decent turnover of the fluid so it hasn't been sitting on a shelf for months and months.
  • Or buy the Walmart Brand for $9 to $12 for 2 1/2 Gal. Been using it since 2005 in three different trucks and no issues.
  • It's cheaper to buy it from a pump at a fuel facility. I get mine from the pump at Quarles for around $4 something a gallon.

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