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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
This is the way it is designed due to the EPA regulations spicifically stating that DEF must be a maintenance item that will need to be filled on a regular basis. So they designed it to last about the same as an oil change. Of course that is based on the vehicles oil life monitor. Many people do oil changes based on their own preference which will get the correlation of the two fluids in difference.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