Def fluid

Hogwash, DEF is 35% Urea solution. It's the same no matter where you get it.

BK

In 40 thousand miles I have only used Peak Blue DEF in 2.5 gal boxes. All but one from WM. When it get to 1/2 on the gauge I drop by a WM and put in a box, and let them recycle the box.

I always check the date code. Here is a sample of how it works.

This is from a Dec 6th 2016 post on another forum.

The code on the box is "12170412431 A"
Doesn't look any different other then the "A" at the end

12 = where made

17= year made plus one

041 = days remaining in the year that is was made

2431 = Actual Batch code

DEF made today by Peak would have

xx19284yyyy code.

That is, it was made 284 days before Jan 1st 2019.

Chris

Have been buying Walmart Peak Blue DEF since I bought the 2012 F350 new. Never a Problem. Same brand that is sold at local auto parts stores.

Its the universal answer from the dlr. I had a 2011 GMC and the tank had to be replaced at 600 mi and again at around 75k mi. As well as a sensor a couple of times. It has nothing to do with the def you are using.

I agree that DEF is universal. But I have run into DEF which has long passed its expiration date. And the clerk had no idea that there is an expiration date.
so I would advise that it is ok to buy DEF from Walmart as long as the expiration date has not come and gone.

Have used Super Tech DEF from walmart for the last three years 38K miles with no problems. I fill it up when I'm going to pull the 5er more than 3000 miles. Other than that I add a gallon at a time when it gets low keeping it as fresh as I can.

I spray it on my hay fields as a foliar innoculant. Makes good fertilizer. Cat pee in a jug. 32% urea and di-ionized water.

Urea is processed 'poop'.

Far as old or not old, I'd just check the end date on the jug.

agesilaus wrote:
Hogwash, DEF is 35% Urea solution. It's the same no matter where you get it.

BK

It has only 2 ingredients. Dealer is full of bull. I've used WalMart brand for over 60,000 miles. Half the price of what the dealer sells. Probably made by the same people.

B.O.

He's full of it. The sensors have been problematic (your dealer knows this) and he needs to replace yours.
BTW, he would have said the same thing no matter where you got the DEF. Did you notice he asked you where you got it rather than just tell you Walmart fluid is junk?

I have used the Walmart brand in the blue jug since I got the new truck in 2016. No problems so far. :)
Barney