Def fluid

[SDM]

Have a 2011 Duramax. Have had a sensor problem. Dealer says the def from Walmart is giving some problems. Any thoughts.

[Me_Again]

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

[agesilaus]

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

BK