Poor Def Quality SPN 3364 FMI 2 DD15 Cascadia EVO 2014

Hi
I replace thermostat and Engine oil Sensor since then I am keep getting "poor def quality" message with following error codes and blinking orange def light.
Temp sensor working good as meter show accurate warm coolant to 200.


I usually use BULK DEF
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SPN 3364 FMI 2
SPN 4364 FMI 18
SPN 5246 FMI 15
SPN 5246 FMI 16
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SPN 3226 FMI 20 (Happens only once, fix this error with Detroit dealer they told me everything is fine no need to do anything like DPF cleaning)

I also replace DEF filter. from Dallas TA, they told me my def was not good. drain and replace DEF filter. cost me US 680$.

After getting these errors I start using BLUE DEF. till once get poor def quality error temp was below -9.

I took truck to three mechanics they told me my DPF is good no need to clean DPF.

******* I notice I get these errors once temp goes below -10, as i drive to Laredo TX where I never had any problem in hot weather. ******

So far Regen helped me to get rid of these errors.

One guy told me to check DEF heater may be def heater is not working good. my current mechanic told me that circulation of coolant is good as hot coolant keep def warm.

Any idea to start from.

 

I think same way, current issue gave better understanding of DEF than some mechanics,

 

Well Error is gone for why, I really dont know. Whole I did in this situation
1) Stop buying bulk DEF from bad pumps. (specilly in night time or less rush hours)
2) use Box blue def.
3) Put cardbord in front of radiator grill to warm my coolant. I was start drving without making my truck enough warm in coold weather. so I cover my front of radiator which is making my truck warm.
4) On uphill or downhill use lower gears to make oil pressure go up. I dnt know exactly but i think low oil pressure has some link to create def or emission realted errors.

 

Bad day again, I got these All above errors came back on me, whole i did i forgot my lesson I bought bulk def from Love Mt. Vernon TX in early morning and guess what I got these errors in TX first time and i did not stop I kept driving I wanted to see what happen, truck went to 80 KM per hour, after 20 mins of driving errors went off and truck normal and this pattern happen for next two days and I bought box blue def and guess what PROBLEM SOLVED AGAIN.!!!!
MIL light with no active error stayed on for a while and than went off and came back on. but no errors so far.!!!!