I had to replace both nox sensors at around 40,000 miles. They were covered under warranty. The GM dealer asked what def fluid I was using. Had been using Blue Def from Walmart, he said that Blue def was causing problems with the sensors and recommend either GM or Flying J. Has anyone else had good or bad results?

SDM wrote:I had to replace both nox sensors at around 40,000 miles. They were covered under warranty. The GM dealer asked what def fluid I was using. Had been using Blue Def from Walmart, he said that Blue def was causing problems with the sensors and recommend either GM or Flying J. Has anyone else had good or bad results?Nonsense. The Peak Blue DEF meets all the requirements set by GM.

Been using Peak Blue DEF from day one and no issues. 72,000 miles. 2011 Chevy 2500HD CC4X4(LML)LateRoger

JustLabs wrote:SDM wrote:I had to replace both nox sensors at around 40,000 miles. They were covered under warranty. The GM dealer asked what def fluid I was using. Had been using Blue Def from Walmart, he said that Blue def was causing problems with the sensors and recommend either GM or Flying J. Has anyone else had good or bad results?Nonsense. The Peak Blue DEF meets all the requirements set by GM.^^^^This!!What the dealer told you is COMPLETE BS. Both GM and Ford has been having problems with their sensors. More than likely they are from the same off shore vendor. :R

RADROG wrote:Been using Peak Blue DEF from day one and no issues. 72,000 miles. 2011 Chevy 2500HD CC4X4(LML)LateRogerPHEW :R !!! makes me feel a whole bunch better! Thanks! I'm using the Wall Mart brand too.

If you were buying it from a guy walking around a truck stop with a jug full of yellow liquid he's selling as Urea, you'd have a problem. All real DEF is made all the same - it's clear with 32.5% Urea and 67.5% deionized water.

Duramax and Blue Def | Good Sam Community

25 Replies

ramgunner
Explorer
Mar 17, 2015
If you were buying it from a guy walking around a truck stop with a jug full of yellow liquid he's selling as Urea, you'd have a problem. All real DEF is made all the same - it's clear with 32.5% Urea and 67.5% deionized water.
DutchmenSport
Explorer
Mar 17, 2015
RADROG wrote:
Been using Peak Blue DEF from day one and no issues. 72,000 miles. 2011 Chevy 2500HD CC4X4(LML)

Late
Roger

PHEW :R !!! makes me feel a whole bunch better! Thanks! I'm using the Wall Mart brand too.
Turtle_n_Peeps
Explorer
Mar 17, 2015
JustLabs wrote:
SDM wrote:
I had to replace both nox sensors at around 40,000 miles. They were covered under warranty. The GM dealer asked what def fluid I was using. Had been using Blue Def from Walmart, he said that Blue def was causing problems with the sensors and recommend either GM or Flying J. Has anyone else had good or bad results?

Nonsense. The Peak Blue DEF meets all the requirements set by GM.

^^^^This!!

What the dealer told you is COMPLETE BS. Both GM and Ford has been having problems with their sensors. More than likely they are from the same off shore vendor. :R
RADROG
Explorer
Mar 17, 2015
Been using Peak Blue DEF from day one and no issues. 72,000 miles. 2011 Chevy 2500HD CC4X4(LML)

Late
Roger
JustLabs
Explorer
Mar 17, 2015
SDM wrote:
I had to replace both nox sensors at around 40,000 miles. They were covered under warranty. The GM dealer asked what def fluid I was using. Had been using Blue Def from Walmart, he said that Blue def was causing problems with the sensors and recommend either GM or Flying J. Has anyone else had good or bad results?

Nonsense. The Peak Blue DEF meets all the requirements set by GM.

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Duramax and Blue Def

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