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DEF has a limited shelf life and it's dependent on stowage temperature. I only had to buy one container so far and was not happy that there was no data for expiration nor manufacture date on the package. Given the potential expensive repairs possible, maybe the cheapest way to try and fix this is to extract the DEF and fill with fresh fluid? Hope it's not any worse than that. Do keep us posted on how you correct this problem.

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how many times do you know of that 'bad def' was actually to blame?

im not aware of any.
neither are the 20 or field mechanics that ive asked.
100+ yrs of experience, and no time was the def ever 'bad'
 

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Yes, what is your point? A guy fills DEF and gets poor DEF warning, like OP... How's that not relevant? If poor DEF was not a possibility why does the car even monitor for this? As an engineer, it's clear this was an anticipated problem, hence the system to monitor quality.

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his 'bad def' problem was solved how?....yeah, couple miles later the cel went away....there was no problem...there was no 'bad def'

the cruze nor other vehicles for that matter do not have the ability to monitor the quality of the def on board.

computer gets info from the sensors, if its out of whack, def quality cel goes on....

but its never the def that is the issue....perhaps an overstatement....its never been the def in any circumstance that im aware of, in hundreds of vehicles.

but 'bad def' gets bandied aboot needlessly.

you know how mechanics (again or at least the mechanics ive spoken with) test the quality of def? pour it in a water bottle, if it looks like def, its def...it dont look like water

not one of them had a def refractor, nor did their shops

its not gonna be the def.
 
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