Quote:
Originally Posted by TheWolfPaq82
Not true. Just added 2.5 gals to mine and it reset after one start.
Instead of "Not True" maybe I should say....it reset on mine after adding only 2.5 gals.
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The tech (who said when the warning light comes on, you must fill the tank to full) was wrong or maybe giving a shortcut. When the light comes on, you have to add at least 2 gals. for the warning to reset. But then, why not fill it up? The point is, if you add only 1 gal. it will not reset.
From the MBS manual:
If the DEF level has dropped below the reserve range, add at least 2.0 US gal (7.6l) of DEF at the latest after receiving the second warning message.
The DEF capacity of the 3500 model is 4.7 gals.
The approximate mileage for a gallon of DEF per the manual is 1720 mpg, which may vary depending on driving styles and conditions.
For 13K miles over 1-1/2 yrs., I added 2 gals. once on the road from a jug using a funnel (messy), the dealer added a couple of gallons at oil change, and I added 2-3 gals. at a truck stop DEF pump (those are nice!). It could probably use a gallon now. So that's roughly 8 gals. In 13K miles or about 1600 mpg.