Is all DEF the same?

[way2roll]

I had been buying BLUE DEF for the past year. "Gold star, premium, blah blah blah..." Recently at the auto parts store the clerk showed me they had FRAM Def. It was literally half the price. So I bout 2 jugs, put them in and have been running it now for over a month. Today at the same auto parts store someone was buying BLUE and I tipped him to my recent find. To my surprise, another clerk said not to buy the FRAM brand that it can cause issues? I was like, wha..? Then why are you selling it? In all my research everything says that DEF is DEF is DEF provided it has the right percentage of urea to water. I mean, it's just atomized into your exhaust to neutralize harmful emissions. So is fancy DEF any better than house brand stuff? What about DEF at the pump - who knows what brand that is.

[FishOnOne]

I think the bigger story is the shortage of DEF due to Urea and China holding back shipments of this raw material. The next big story will be a shortage of fertilizer.

[Bionic_Man]

I use the stuff from Walmart that is about 1/3 the price of Peak. If you really want Peak, find them on instagram and you can print a $5 rebate per box, through 1/10/22.

[2oldman]

"The main component that sets brands of DEF apart from each other is the level of purity in the product. DEF fluids all must meet an international standard and standards from the EPA that measure the purity of this fluid. Only purchase a DEF that meets the ISO 22241 standard."

[FishOnOne]

Link

[Lwiddis]

"DEF is highly regulated in the formula" x2

[ktmrfs]

yes, DEF is highly regulated in the formula. Every mfg must follow the same formulation.

[agesilaus]

I'm a retired chemist and we used to buy DEF by the tank car load. It's all the same the $8 stuff is the sames as the $20 stuff.

[IdaD]

DEF is DEF. Pump, Supertech from Walmart or Peak. Just my opinion.

I use Peak for the most part but that's just because Costco carries it and I'm there weekly for groceries/etc. and don't have to make a special trip to Walmart or a pump. The convenience is worth a few bucks extra. It's $10 a few times a year, which means nothing.