DEF

BoostN

Administrator
Staff member
275
42
TN
Year
2021
I'm at 4000K miles, and still shows 50% full. I usually add a 2.5 each oil change in my previous DEF equipped trucks.
 

Kwalk1959

New member
10
1
Year
2021
Thx guys, Im new to DEF and Ive heard DEF has a shelf life and also freezes. So is it better to keep it full or run it down and fill. I dont put a lot of miles on, maybe 10,000 yr.
 

CompuDragon

Active member
225
52
Denton, Texas
Year
2021
update i got in a hurry and just took on fuel last stop. this morning a screen poped up on the dash saying 1000 miles left of DEF and started counting down. had no idea it would do that.currently about 6500 miles
 

BoostN

Administrator
Staff member
275
42
TN
Year
2021
update i got in a hurry and just took on fuel last stop. this morning a screen poped up on the dash saying 1000 miles left of DEF and started counting down. had no idea it would do that.currently about 6500 miles

In my previous truck, sometimes it would say 1000 miles, then 100 miles later your down to the 500 miles warning.
 

CompuDragon

Active member
225
52
Denton, Texas
Year
2021
update had the dealer change the oil and fill the DEF tank yesterday. they left it two bars short of full but comped the entire visit should i say something? should i go ahead and fill it myself to keep it in sync with the oil changes? i think that was the intent to need DEF about the same time you need an oil change not 100 percent on that but i could swear i heard one of the designers say that in a video.

IBM presents YOU make the call!

Thanks
 

BoostN

Administrator
Staff member
275
42
TN
Year
2021
You can add/update whenever the def is needed. If you want to track amount used per oil changed I guess keeping it full on each change would help with that, otherwise don't worry!
 

Kwalk1959

New member
10
1
Year
2021
I was talking to some other guys that have DEF trucks. Two of them said that when they use the cheaper blue DEF the have to fill up more often than when they use the DEF pump at Royal Farms. Any of you guys finding the same thing?? One of them said its 1000 mile difference.
 

BoostN

Administrator
Staff member
275
42
TN
Year
2021
DEF is def, I don't see how.. but interesting to say the least.
 
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